v0.23.0: covers for the whole album

- Multi-select Get Info keeps the art square; a pasted cover goes into
  every selected track (shared cover shown, else "mixed artwork").
- Paste Artwork button + Ctrl+V anywhere outside a text field; a caption
  says what happened. Clipboard reads that don't decode are retried and
  never staged; every attempt is logged at INFO.
- Album art search queries Deezer alongside iTunes and ranks by album
  match (iTunes has no copy of Digable Planets' Reachin' at all).
- embed_artwork shared by Get Info and Download Album Art; single-track
  Get Info now invalidates the MPRIS art cache.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CLAUDE.md

@@ -195,6 +195,20 @@ persistence) → GUI (Qt widgets that read the manager and connect to its signal
   Stdlib only, cached, and every failure path returns `None` — a machine with no
   Syncthing must still merge, just without naming anyone.
 
+- **`lintunes/art_search.py`** — Download Album Art. Queries **both** the
+  iTunes Search API and Deezer's public album search (neither needs a key)
+  and merges them through `rank_candidates`: album match beats artist match,
+  so a right-artist, wrong-album hit never wins. Two sources because neither
+  catalog is complete: iTunes has **no copy at all** of Digable Planets'
+  *Reachin'*, which Deezer finds on the first query (Round 60). One source
+  failing is not an error while the other answers. Embedding, whether from
+  there or from Get Info, goes through `gui/art_ops.embed_artwork`: write,
+  `mpris.invalidate_artwork`, size refresh. Get Info's `ArtSquare` **never
+  stages bytes that don't decode** (`clipboard_image` checks every candidate
+  with `QImage.loadFromData`), because a clipboard can advertise `image/png`
+  and hand over nothing. Every paste attempt is logged at INFO
+  (`lintunes.gui.info_dialog`), so it shows up in the journal.
+
 - **`lintunes/fingerprint.py`** — "Identify Track…": Chromaprint's `fpcalc`
   CLI (detected with `shutil.which`, the `ffmpeg_available()` pattern — a
   runtime tool, never a pip dep) fingerprints the file, and AcoustID's web API

lintunes/__init__.py

@@ -1,3 +1,3 @@
 """LinTunes — iTunes-style music library manager and player for Linux."""
 
-__version__ = "0.22.1"
+__version__ = "0.23.0"

lintunes/art_search.py

@@ -1,17 +1,26 @@
-"""Album-art lookup via the iTunes Search API (no API key required).
+"""Album-art lookup via the iTunes Search API and Deezer (neither needs a key).
 
-Pure parsing/URL helpers are separated from the network calls so they can be
-tested offline; ``AlbumArtFetcher`` runs the whole search+download on a
+Two catalogs because neither is complete: iTunes has no copy at all of some
+well-known albums (Digable Planets' *Reachin'* returns nothing however it's
+spelled) that Deezer finds on the first try, and vice versa. Results from both
+are merged and ranked by how well they match what was asked for, so a stray
+hit from the artist's other album never outranks the real one.
+
+Pure parsing/ranking helpers are separated from the network calls so they can
+be tested offline; ``AlbumArtFetcher`` runs the whole search+download on a
 daemon thread (the lastfm pattern) and reports back over a Qt signal, which
 is delivered queued on the GUI thread.
 """
+import re
 import threading
+import unicodedata
 from dataclasses import dataclass
 
 from PyQt6.QtCore import QObject, pyqtSignal
 
 
 ITUNES_SEARCH_URL = "https://itunes.apple.com/search"
+DEEZER_SEARCH_URL = "https://api.deezer.com/search/album"
 ART_SIZE = 600  # px; the API hands out 100x100 URLs that scale on request
 TIMEOUT_S = 15
 
@@ -21,6 +30,7 @@ class ArtCandidate:
     artist: str
     album: str
     art_url: str  # already upgraded to ART_SIZE
+    source: str = "iTunes"
 
 
 def upgrade_artwork_url(url: str, size: int = ART_SIZE) -> str:
@@ -39,22 +49,153 @@ def parse_results(payload: dict) -> list[ArtCandidate]:
             artist=item.get("artistName", ""),
             album=item.get("collectionName", ""),
             art_url=upgrade_artwork_url(url),
+            source="iTunes",
         ))
     return candidates
 
 
-def search_album_art(artist: str, album: str, limit: int = 5) -> list[ArtCandidate]:
+def parse_deezer_results(payload: dict) -> list[ArtCandidate]:
+    candidates = []
+    for item in payload.get("data", []) or []:
+        url = (item.get("cover_xl") or item.get("cover_big")
+               or item.get("cover_medium"))
+        if not url:
+            continue
+        candidates.append(ArtCandidate(
+            artist=(item.get("artist") or {}).get("name", ""),
+            album=item.get("title", ""),
+            art_url=url,
+            source="Deezer",
+        ))
+    return candidates
+
+
+_EDITION_NOISE = re.compile(
+    r"\b(deluxe|remaster(ed)?|expanded|anniversary|special|bonus track"
+    r"|collector'?s)\b.*$", re.IGNORECASE)
+_TRAILING_GROUP = re.compile(r"\s*[\(\[][^\(\)\[\]]*[\)\]]\s*$")
+
+
+def _plain_quotes(text: str) -> str:
+    return (text.replace("’", "'").replace("‘", "'")
+            .replace("“", '"').replace("”", '"'))
+
+
+def _simplify_album(album: str) -> str:
+    """The title without its trailing ``(...)``/``[...]`` groups or edition
+    noise: "Reachin' (A New Refutation of Time and Space)" -> "Reachin'"."""
+    text = _plain_quotes(album).strip()
+    while True:
+        stripped = _TRAILING_GROUP.sub("", text)
+        if stripped == text or not stripped:
+            break
+        text = stripped
+    text = _EDITION_NOISE.sub("", text).strip(" -–—:,")
+    return text or _plain_quotes(album).strip()
+
+
+def _normalize(text: str) -> str:
+    """Case-, accent- and punctuation-blind form used to compare titles."""
+    text = unicodedata.normalize("NFKD", _plain_quotes(text))
+    text = "".join(c for c in text if not unicodedata.combining(c))
+    return " ".join(re.sub(r"[^\w\s]", " ", text.casefold()).split())
+
+
+def rank_candidates(candidates: list[ArtCandidate], artist: str,
+                    album: str) -> list[ArtCandidate]:
+    """Best match first; duplicates (same source, same normalized artist and
+    album) dropped. The album decides more than the artist: a right-artist
+    wrong-album hit is exactly the result that must not win."""
+    want_album = _normalize(album)
+    want_simple = _normalize(_simplify_album(album))
+    want_artist = _normalize(artist)
+    sources = {"iTunes": 0, "Deezer": 1}
+
+    def key(indexed):
+        index, c = indexed
+        got = _normalize(c.album)
+        if got == want_album:
+            album_score = 0
+        elif _normalize(_simplify_album(c.album)) == want_simple:
+            album_score = 1
+        elif want_simple and want_simple in got:
+            album_score = 2
+        else:
+            album_score = 3
+        got_artist = _normalize(c.artist)
+        artist_score = 0 if got_artist == want_artist else (
+            1 if want_artist and want_artist in got_artist else 2)
+        return (album_score, artist_score, sources.get(c.source, 9), index)
+
+    seen = set()
+    unique = []
+    for c in candidates:
+        ident = (c.source, _normalize(c.artist), _normalize(c.album))
+        if ident in seen:
+            continue
+        seen.add(ident)
+        unique.append(c)
+    return [c for _i, c in sorted(enumerate(unique), key=key)]
+
+
+def _itunes_query(term: str, limit: int) -> list[ArtCandidate]:
     import requests
     response = requests.get(
         ITUNES_SEARCH_URL,
-        params={"term": f"{artist} {album}".strip(), "entity": "album",
-                "media": "music", "limit": limit},
+        params={"term": term, "entity": "album", "media": "music",
+                "limit": limit},
         timeout=TIMEOUT_S,
     )
     response.raise_for_status()
     return parse_results(response.json())
 
 
+def search_itunes(artist: str, album: str, limit: int = 5) -> list[ArtCandidate]:
+    found = _itunes_query(f"{artist} {album}".strip(), limit)
+    simple = _simplify_album(album)
+    if not found and simple != album.strip():
+        found = _itunes_query(f"{artist} {simple}".strip(), limit)
+    return found
+
+
+def _deezer_query(query: str, limit: int) -> list[ArtCandidate]:
+    import requests
+    response = requests.get(DEEZER_SEARCH_URL,
+                            params={"q": query, "limit": limit},
+                            timeout=TIMEOUT_S)
+    response.raise_for_status()
+    payload = response.json()
+    if "error" in payload:
+        raise RuntimeError(payload["error"].get("message", "Deezer error"))
+    return parse_deezer_results(payload)
+
+
+def search_deezer(artist: str, album: str, limit: int = 5) -> list[ArtCandidate]:
+    simple = _simplify_album(album).replace('"', "")
+    strict = f'album:"{simple}"'
+    if artist:
+        strict = f'artist:"{artist.replace(chr(34), "")}" ' + strict
+    found = _deezer_query(strict, limit)
+    if not found:
+        found = _deezer_query(f"{artist} {simple}".strip(), limit)
+    return found
+
+
+def search_album_art(artist: str, album: str, limit: int = 5) -> list[ArtCandidate]:
+    """Both catalogs, merged and ranked. One source failing is not an error
+    while the other answers; both failing raises the first failure."""
+    found: list[ArtCandidate] = []
+    errors: list[Exception] = []
+    for search in (search_itunes, search_deezer):
+        try:
+            found.extend(search(artist, album, limit))
+        except Exception as e:  # network, HTTP, JSON — the other may still work
+            errors.append(e)
+    if errors and len(errors) == 2:
+        raise errors[0]
+    return rank_candidates(found, artist, album)
+
+
 def fetch_image(url: str) -> tuple[bytes, str]:
     """Download an image; returns (bytes, mime type)."""
     import requests

lintunes/gui/album_art_dialog.py

@@ -1,6 +1,6 @@
 """Confirmation dialog for downloaded album art.
 
-Shows one iTunes Search result at a time (300px preview + "Artist — Album"),
+Shows one search result (iTunes or Deezer) at a time (300px preview + "Artist — Album"),
 with Next Result cycling through the other matches. Nothing is written until
 the user accepts; the caller then embeds ``selected_image``/``selected_mime``.
 """
@@ -80,7 +80,8 @@ class AlbumArtDialog(QDialog):
         n = len(self._candidates)
         counter = f"  ({self._index + 1}/{n})" if n > 1 else ""
         self._title.setText(
-            f"<b>{candidate.artist} — {candidate.album}</b>{counter}")
+            f"<b>{candidate.artist} — {candidate.album}</b>{counter}"
+            f"<br><small>via {candidate.source}</small>")
         self._image = None
         self._use_btn.setEnabled(False)
         if self._album_btn is not None:

lintunes/gui/art_ops.py

@@ -0,0 +1,33 @@
+"""Embedding cover art into files — shared by Get Info (one track or a whole
+selection) and Download Album Art.
+
+The artwork write itself is not undoable; the size refresh is an in-memory
+update (size isn't a tag field) that also fires ``track_updated``, which is
+what repaints the transport art.
+"""
+from pathlib import Path
+
+from lintunes import mpris, tagging
+
+
+def embed_artwork(manager, tracks, image: bytes, mime: str):
+    """Write ``image`` into every track's file. Returns ``(done, failures)``,
+    failures as ``"Name: error"`` strings; a track with no file is skipped."""
+    failures = []
+    done = 0
+    for track in tracks:
+        if not track.location:
+            continue
+        try:
+            tagging.write_artwork(track.location, image, mime)
+        except Exception as e:
+            failures.append(f"{track.name}: {e}")
+            continue
+        done += 1
+        mpris.invalidate_artwork(track)
+        try:
+            size = Path(track.location).stat().st_size
+        except OSError:
+            continue
+        manager.update_track_fields(track.track_id, {"size": size})
+    return done, failures

lintunes/gui/info_dialog.py

@@ -1,3 +1,4 @@
+import logging
 from pathlib import Path
 
 from PyQt6.QtWidgets import (
@@ -5,32 +6,127 @@ from PyQt6.QtWidgets import (
     QPlainTextEdit, QHBoxLayout, QLabel, QVBoxLayout, QPushButton, QMessageBox,
     QApplication, QMenu, QFileDialog, QWidget,
 )
-from PyQt6.QtCore import Qt, QBuffer, QIODevice, pyqtSignal
-from PyQt6.QtGui import QPixmap, QKeySequence
+from PyQt6.QtCore import Qt, QBuffer, QIODevice, QTimer, pyqtSignal
+from PyQt6.QtGui import QPixmap, QImage, QKeySequence, QShortcut
 
 from lintunes import tagging
+from lintunes.gui.art_ops import embed_artwork
 
+log = logging.getLogger(__name__)
 
 _IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"}
 
+# A read that comes back empty or undecodable is retried this many times,
+# PASTE_RETRY_MS apart, before the square says so. Retries re-ask the
+# clipboard from scratch and also try Qt's decoded-image path, which is a
+# separate read on Wayland (the per-type result is cached per offer).
+PASTE_RETRIES = 3
+PASTE_RETRY_MS = 300
+
+# Past this many tracks the multi-track dialog doesn't open every file to
+# compare covers; it just offers the paste.
+MULTI_ART_READ_LIMIT = 100
+
+HINT_IDLE = "Ctrl+V or Paste Artwork to add a cover"
+HINT_STAGED = "New artwork — saved when you click OK"
+
+
+def _decodes(data: bytes) -> bool:
+    return bool(data) and QImage().loadFromData(data)
+
+
+def _jpeg_bytes(image: QImage) -> bytes:
+    buffer = QBuffer()
+    buffer.open(QIODevice.OpenModeFlag.WriteOnly)
+    image.save(buffer, "JPEG", quality=92)
+    return bytes(buffer.data())
+
+
+def image_file_bytes(path: Path) -> tuple[bytes, str] | None:
+    """(bytes, mime) for an image file every tag format accepts, recoding
+    anything but JPEG/PNG; None if it isn't a readable image."""
+    suffix = path.suffix.lower()
+    if suffix not in _IMAGE_EXTENSIONS or not path.is_file():
+        return None
+    if suffix in (".jpg", ".jpeg", ".png"):
+        data = path.read_bytes()
+        if not _decodes(data):
+            return None
+        return data, "image/png" if suffix == ".png" else "image/jpeg"
+    image = QImage(str(path))
+    if image.isNull():
+        return None
+    return _jpeg_bytes(image), "image/jpeg"
+
+
+def clipboard_image(mime) -> tuple[bytes, str] | None:
+    """The first image in ``mime`` that actually decodes, as (bytes, mime).
+
+    Never trusts a format's presence alone: a clipboard can advertise
+    image/png and hand over nothing (or half a PNG), and staging those bytes
+    would embed a broken cover on OK."""
+    if mime is None:
+        return None
+    # Prefer raw image file bytes (keeps original compression)
+    for fmt in ("image/jpeg", "image/png"):
+        if mime.hasFormat(fmt):
+            data = bytes(mime.data(fmt))
+            ok = _decodes(data)
+            log.info("art paste: %s %d bytes, decodes=%s", fmt, len(data), ok)
+            if ok:
+                return data, fmt
+    if mime.hasImage():
+        image = mime.imageData()
+        ok = isinstance(image, QImage) and not image.isNull()
+        log.info("art paste: decoded image, ok=%s", ok)
+        if ok:
+            return _jpeg_bytes(image), "image/jpeg"
+    if mime.hasUrls():
+        for url in mime.urls():
+            if url.isLocalFile():
+                found = image_file_bytes(Path(url.toLocalFile()))
+                log.info("art paste: file %s, ok=%s", url.toLocalFile(),
+                         found is not None)
+                if found:
+                    return found
+    return None
+
+
+def _has_image_hint(mime) -> bool:
+    """Whether the clipboard claims to hold something image-like at all —
+    only then is a failed read worth retrying."""
+    if mime is None:
+        return False
+    return (mime.hasImage() or mime.hasUrls()
+            or any(f.startswith("image/") for f in mime.formats()))
+
 
 class ArtSquare(QLabel):
-    """Clickable cover-art square: click to focus, then paste (Ctrl+V) or
-    drop an image file to stage new artwork."""
+    """Cover-art square: paste (Ctrl+V, the Paste button, or right-click) or
+    drop an image file to stage new artwork. Nothing is written until the
+    dialog's OK."""
 
     art_staged = pyqtSignal(bytes, str)  # image bytes, mime
+    hint_changed = pyqtSignal(str)
 
     def __init__(self, parent=None):
         super().__init__(parent)
         self.setFixedSize(120, 120)
         self.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        self.setWordWrap(True)
         self.setFocusPolicy(Qt.FocusPolicy.ClickFocus)
         self.setAcceptDrops(True)
         self.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
         self.customContextMenuRequested.connect(self._show_menu)
+        self._retries_left = 0
+        self._retry_timer = QTimer(self)
+        self._retry_timer.setSingleShot(True)
+        self._retry_timer.setInterval(PASTE_RETRY_MS)
+        self._retry_timer.timeout.connect(self._try_paste)
         self.set_artwork(None)
 
-    def set_artwork(self, image_bytes: bytes | None):
+    def set_artwork(self, image_bytes: bytes | None,
+                    placeholder: str = "no artwork"):
         if image_bytes:
             pixmap = QPixmap()
             if pixmap.loadFromData(image_bytes):
@@ -39,13 +135,13 @@ class ArtSquare(QLabel):
                     Qt.TransformationMode.SmoothTransformation))
                 self.setStyleSheet(
                     "ArtSquare { border: 1px solid palette(mid); }"
-                    "ArtSquare:focus { border: 2px solid palette(highlight); }")
+                    "ArtSquare:focus { border: 3px solid palette(highlight); }")
                 return
         self.setPixmap(QPixmap())
-        self.setText("no artwork\n\nclick, then paste\nan image")
+        self.setText(placeholder)
         self.setStyleSheet(
             "ArtSquare { border: 2px dashed palette(mid); color: palette(mid); }"
-            "ArtSquare:focus { border: 2px dashed palette(highlight); }")
+            "ArtSquare:focus { border: 3px dashed palette(highlight); }")
 
     # ---- staging from clipboard / files ----
 
@@ -56,47 +152,44 @@ class ArtSquare(QLabel):
             super().keyPressEvent(event)
 
     def paste_from_clipboard(self):
+        self._retries_left = PASTE_RETRIES
+        self._retry_timer.stop()
+        self._try_paste()
+
+    def _try_paste(self):
         mime = QApplication.clipboard().mimeData()
-        if mime is None:
+        if mime is not None:
+            log.info("art paste: clipboard offers %s", mime.formats())
+        found = clipboard_image(mime)
+        if found:
+            self._stage(*found)
             return
-        # Prefer raw image file bytes (keeps original compression)
-        for fmt in ("image/jpeg", "image/png"):
-            if mime.hasFormat(fmt):
-                self._stage(bytes(mime.data(fmt)), fmt)
+        if not _has_image_hint(mime):
+            self.hint_changed.emit("The clipboard doesn't hold an image")
             return
-        if mime.hasImage():
-            image = QApplication.clipboard().image()
-            if not image.isNull():
-                buffer = QBuffer()
-                buffer.open(QIODevice.OpenModeFlag.WriteOnly)
-                image.save(buffer, "JPEG", quality=92)
-                self._stage(bytes(buffer.data()), "image/jpeg")
-                return
-        if mime.hasUrls():
-            for url in mime.urls():
-                if url.isLocalFile() and self._stage_file(Path(url.toLocalFile())):
+        if self._retries_left > 0:
+            self._retries_left -= 1
+            self.hint_changed.emit("Reading the clipboard…")
+            self._retry_timer.start()
             return
+        self.hint_changed.emit("Couldn't read an image from the clipboard")
 
     def _stage_file(self, path: Path) -> bool:
-        if path.suffix.lower() not in _IMAGE_EXTENSIONS or not path.is_file():
+        found = image_file_bytes(path)
+        if found is None:
             return False
-        mime = "image/png" if path.suffix.lower() == ".png" else "image/jpeg"
-        if path.suffix.lower() not in (".jpg", ".jpeg", ".png"):
-            # Recode exotic formats to JPEG so all tag formats accept them
-            pixmap = QPixmap(str(path))
-            if pixmap.isNull():
-                return False
-            buffer = QBuffer()
-            buffer.open(QIODevice.OpenModeFlag.WriteOnly)
-            pixmap.save(buffer, "JPEG", quality=92)
-            self._stage(bytes(buffer.data()), "image/jpeg")
-            return True
-        self._stage(path.read_bytes(), mime)
+        self._stage(*found)
         return True
 
     def _stage(self, image_bytes: bytes, mime: str):
+        if not _decodes(image_bytes):
+            # Backstop for every path in: a cover that won't decode here
+            # won't show anywhere else either.
+            self.hint_changed.emit("That image couldn't be read")
+            return
         self.set_artwork(image_bytes)
         self.art_staged.emit(image_bytes, mime)
+        self.hint_changed.emit(HINT_STAGED)
 
     def _show_menu(self, pos):
         menu = QMenu(self)
@@ -106,21 +199,24 @@ class ArtSquare(QLabel):
         if chosen is paste:
             self.paste_from_clipboard()
         elif chosen is choose:
+            self.choose_file()
+
+    def choose_file(self):
         file_name, _filter = QFileDialog.getOpenFileName(
             self, "Choose Artwork", "",
             "Images (*.jpg *.jpeg *.png *.gif *.bmp *.webp)")
-            if file_name:
-                self._stage_file(Path(file_name))
+        if file_name and not self._stage_file(Path(file_name)):
+            self.hint_changed.emit("That file isn't a readable image")
 
     def dragEnterEvent(self, event):
         if event.mimeData().hasUrls() or event.mimeData().hasImage():
             event.acceptProposedAction()
 
     def dropEvent(self, event):
-        for url in event.mimeData().urls():
-            if url.isLocalFile() and self._stage_file(Path(url.toLocalFile())):
+        found = clipboard_image(event.mimeData())
+        if found:
+            self._stage(*found)
             event.acceptProposedAction()
-                return
 
 
 _TEXT_FIELDS = [
@@ -220,7 +316,24 @@ class InfoDialog(QDialog):
         self._art_square = ArtSquare()
         self._art_square.art_staged.connect(self._on_art_staged)
         art_col.addWidget(self._art_square)
+        self._art_hint = QLabel(HINT_IDLE)
+        self._art_hint.setWordWrap(True)
+        self._art_hint.setFixedWidth(self._art_square.width())
+        self._art_hint.setStyleSheet("color: gray; font-size: 10px;")
+        self._art_square.hint_changed.connect(self._art_hint.setText)
+        art_col.addWidget(self._art_hint)
+        paste_art = QPushButton("Paste Artwork")
+        paste_art.setAutoDefault(False)
+        paste_art.setFixedWidth(self._art_square.width())
+        paste_art.clicked.connect(self._art_square.paste_from_clipboard)
+        art_col.addWidget(paste_art)
         art_col.addStretch()
+        # Ctrl+V anywhere in the dialog that isn't a text field pastes the
+        # cover — no need to land a click on the square first. Text fields
+        # claim Paste through ShortcutOverride, so they keep their own.
+        QShortcut(QKeySequence.StandardKey.Paste, self,
+                  context=Qt.ShortcutContext.WindowShortcut,
+                  activated=self._art_square.paste_from_clipboard)
         top.addLayout(art_col)
         self._staged_art: tuple[bytes, str] | None = None
 
@@ -281,8 +394,8 @@ class InfoDialog(QDialog):
         buttons.rejected.connect(self.reject)
 
         if self._multi:
-            # Batch editing: no single file, no per-track art/times navigation.
-            self._art_square.setVisible(False)
+            # Batch editing: no single file, no per-track times navigation.
+            # Artwork stays: a pasted cover goes into every selected track.
             self._start_row.setVisible(False)
             self._stop_row.setVisible(False)
             self._file_label.setVisible(False)
@@ -319,6 +432,24 @@ class InfoDialog(QDialog):
         first = values[0]
         return first if all(v == first for v in values) else _MIXED
 
+    def _common_artwork(self) -> bytes | None:
+        """The cover every selected track shares, else None (also None past
+        MULTI_ART_READ_LIMIT, where opening every file isn't worth it)."""
+        if len(self._track_ids) > MULTI_ART_READ_LIMIT:
+            return None
+        tracks = self._manager.library.tracks
+        first = None
+        for index, tid in enumerate(self._track_ids):
+            location = tracks[tid].location
+            art = tagging.read_embedded_artwork(location) if location else None
+            if art is None:
+                return None
+            if index == 0:
+                first = art
+            elif art != first:
+                return None
+        return first
+
     def _on_art_staged(self, image_bytes: bytes, mime: str):
         self._staged_art = (bytes(image_bytes), mime)
 
@@ -330,6 +461,7 @@ class InfoDialog(QDialog):
         existing_art = (tagging.read_embedded_artwork(track.location)
                         if track.location else None)
         self._art_square.set_artwork(existing_art)
+        self._art_hint.setText(HINT_IDLE)
         for field, _label in _TEXT_FIELDS:
             self._editors[field].setText(getattr(track, field) or "")
         for field, _label, _max in _NUMBER_FIELDS:
@@ -350,6 +482,9 @@ class InfoDialog(QDialog):
     def _load_multi(self):
         self._loading = True
         self.setWindowTitle(f"{len(self._track_ids)} Items — Info")
+        self._art_square.set_artwork(
+            self._common_artwork(),
+            placeholder=f"mixed artwork\n\npaste to set\nall {len(self._track_ids)}")
         for field, _label in _TEXT_FIELDS:
             common = self._common_value(field)
             editor = self._editors[field]
@@ -409,21 +544,20 @@ class InfoDialog(QDialog):
         fields_changed = any(getattr(track, k) != v for k, v in fields.items())
         if not fields_changed and self._staged_art is None:
             return True
-        if track.location:
-            try:
         if self._staged_art is not None:
-                    tagging.write_artwork(track.location, *self._staged_art)
-            except Exception as e:
+            # Embedding also refreshes the library's size (which triggers
+            # track_updated, so the transport art repaints).
+            _done, failures = embed_artwork(self._manager, [track],
+                                            *self._staged_art)
+            if failures:
                 QMessageBox.warning(self, "Tag write failed",
-                                    f"Could not write tags to file:\n{e}")
+                                    "Could not write artwork to file:\n"
+                                    + failures[0])
                 return False
-            if self._staged_art is not None:
-                # Embedding art changed the file; keep the library's size honest
-                # (and trigger track_updated so the transport art refreshes)
-                fields["size"] = Path(track.location).stat().st_size
-        # Field edits (incl. the post-art size bump) go through the manager,
-        # which writes the file tags and records the change for undo. Artwork
-        # itself is written above and is intentionally not undoable.
+        # Field edits go through the manager, which writes the file tags and
+        # records the change for undo. Artwork itself is written above and is
+        # intentionally not undoable.
+        fields.pop("size", None)
         self._manager.edit_track_fields(track.track_id, fields)
         self._staged_art = None
         return True
@@ -440,6 +574,23 @@ class InfoDialog(QDialog):
             fields["compilation"] = self._compilation.isChecked()
         if "comments" in self._touched:
             fields["comments"] = self._comments.toPlainText().strip()
+        if self._staged_art is not None:
+            tracks = [self._manager.library.tracks[tid]
+                      for tid in self._track_ids]
+            QApplication.setOverrideCursor(Qt.CursorShape.WaitCursor)
+            try:
+                _done, failures = embed_artwork(self._manager, tracks,
+                                                *self._staged_art)
+            finally:
+                QApplication.restoreOverrideCursor()
+            if failures:
+                # The rest landed; say which didn't, then carry on with the
+                # field edits rather than leaving the dialog half-applied.
+                QMessageBox.warning(
+                    self, "Tag write failed",
+                    "Couldn't embed artwork in some files:\n\n"
+                    + "\n".join(failures[:10]))
+            self._staged_art = None
         if fields:
             self._manager.edit_tracks_fields(self._track_ids, fields)
         return True

lintunes/gui/main_window.py

@@ -9,7 +9,7 @@ from PyQt6.QtWidgets import (
 from PyQt6.QtCore import Qt, QEvent, QTimer
 from PyQt6.QtGui import QAction, QKeySequence
 
-from lintunes import device_sync, mpris, music_folder, tagging, theme, url_import
+from lintunes import device_sync, music_folder, theme, url_import
 from lintunes.andtunes import layout as andtunes_layout
 from lintunes.andtunes import install as andtunes_install
 from lintunes.andtunes import sync as andtunes_sync
@@ -23,6 +23,7 @@ from lintunes.inhibit import INHIBIT_LOGOUT, INHIBIT_SUSPEND, SleepInhibitor
 from lintunes.player import Player
 from lintunes.importers import file_importer
 from lintunes.gui.album_art_dialog import AlbumArtDialog
+from lintunes.gui.art_ops import embed_artwork
 from lintunes.gui.cast_dialog import ChromecastDialog
 from lintunes.gui.device_sync_dialog import DeviceSyncSettingsDialog
 from lintunes.gui.export_dialog import ExportKindDialog, WebMixDialog
@@ -1390,26 +1391,9 @@ class MainWindow(QMainWindow):
         self._art_next_group()
 
     def _embed_album_art(self, tracks, image: bytes, mime: str):
-        """Embed confirmed artwork into each track's file. Like the Info
-        dialog, the artwork write itself is not undoable; the size refresh is
-        an in-memory update (size isn't a tag field)."""
-        failures = []
-        done = 0
-        for track in tracks:
-            if not track.location:
-                continue
-            try:
-                tagging.write_artwork(track.location, image, mime)
-            except Exception as e:
-                failures.append(f"{track.name}: {e}")
-                continue
-            done += 1
-            mpris.invalidate_artwork(track)
-            try:
-                size = Path(track.location).stat().st_size
-            except OSError:
-                continue
-            self._manager.update_track_fields(track.track_id, {"size": size})
+        """Embed confirmed artwork into each track's file (not undoable —
+        see ``art_ops``)."""
+        done, failures = embed_artwork(self._manager, tracks, image, mime)
         if failures:
             QMessageBox.warning(
                 self, "Download Album Art",

tasks-done.md

@@ -1,5 +1,32 @@
 ## Done
 
+### Round 60 (2026-09-22) — covers for the whole album (v0.23.0)
+
+- [x] **Paste artwork onto a multi-selection.** Multi-track Get Info keeps
+      the art square. It shows the shared cover if every track (≤100) has
+      the same one, otherwise "mixed artwork". A pasted cover goes into
+      every selected track on OK; untouched, nothing is written.
+- [x] **Paste that takes the first time.** There's now a Paste Artwork
+      button, and Ctrl+V anywhere in the dialog outside a text field pastes
+      the cover, so no click has to land on the square first. A caption
+      says what happened ("New artwork — saved when you click OK", "The
+      clipboard doesn't hold an image", …). A read that doesn't decode is
+      retried 3× at 300 ms and is **never staged**; before this, a
+      half-read PNG would blank the square and could have been embedded on
+      OK. The root cause of the flaky paste is unconfirmed: the journal
+      shows no Qt Wayland clipboard timeouts. So each attempt now logs its
+      formats, byte counts and decode result at INFO, where the journal
+      will show the next failure.
+- [x] **Deezer as a second art source.** iTunes has no *Reachin'* at all;
+      Deezer has it at 1000 px. Results are merged and ranked by album
+      match; the dialog says "via iTunes/Deezer". iTunes retries with the
+      title minus its parenthetical ("Reachin'") when the full one finds
+      nothing.
+- [x] `embed_artwork` shared by Get Info and Download Album Art. Single-track
+      Get Info now invalidates the MPRIS art cache too; it never did.
+- [x] Drag an image straight from a browser onto the square (image data,
+      not only local files).
+
 ### Round 58 (2026-09-18) — lookup on youtube (v0.22.0)
 
 - [x] **"lookup on youtube" in a song's right-click menu.** Opens the default

tests/test_round60.py

@@ -0,0 +1,279 @@
+"""Round 60: album art for a whole selection, a paste that never stages a
+broken image, and Deezer as a second art-search source."""
+import shutil
+
+import pytest
+from PyQt6.QtCore import QMimeData, QUrl
+
+from lintunes import art_search, tagging
+from lintunes.art_search import (
+    ArtCandidate, _simplify_album, parse_deezer_results, rank_candidates,
+    search_album_art,
+)
+from lintunes.library_manager import LibraryManager
+from lintunes.models import Track
+from lintunes.models.library import Library
+
+
+def _manager(tmp_path, tracks=()):
+    library = Library()
+    for track in tracks:
+        library.tracks[track.track_id] = track
+    return LibraryManager(library, tmp_path)
+
+
+def _copies(mp3_file, tmp_path, n):
+    tracks = []
+    for i in range(1, n + 1):
+        path = tmp_path / f"song{i}.mp3"
+        shutil.copyfile(mp3_file, path)
+        tracks.append(Track(track_id=i, name=f"Song {i}", artist="A",
+                            album="B", location=str(path), size=1))
+    return tracks
+
+
+# ---- search: Deezer + ranking ----
+
+REACHIN = "Reachin' (A New Refutation of Time and Space)"
+
+
+class TestDeezer:
+    def test_parse_prefers_xl_cover(self):
+        payload = {"data": [
+            {"title": REACHIN, "artist": {"name": "Digable Planets"},
+             "cover_xl": "https://x/1000.jpg", "cover_big": "https://x/500.jpg"},
+            {"title": "No Cover", "artist": {"name": "Z"}},
+        ]}
+        [c] = parse_deezer_results(payload)
+        assert c.source == "Deezer"
+        assert c.art_url == "https://x/1000.jpg"
+        assert c.artist == "Digable Planets"
+
+    def test_simplify_album(self):
+        assert _simplify_album(REACHIN) == "Reachin'"
+        assert _simplify_album("Reachin’ (A New Refutation)") == "Reachin'"
+        assert _simplify_album("Rumours (Deluxe Edition) [Remastered]") == "Rumours"
+        assert _simplify_album("Abbey Road - Remastered 2019") == "Abbey Road"
+        assert _simplify_album("(What's the Story) Morning Glory?") \
+            == "(What's the Story) Morning Glory?"
+
+    def test_right_album_outranks_right_artist(self):
+        stray = ArtCandidate("Digable Planets", "Blowout Comb", "u1", "iTunes")
+        real = ArtCandidate("Digable Planets",
+                            "Reachin’ (A New Refutation Of Time And Space)",
+                            "u2", "Deezer")
+        ranked = rank_candidates([stray, real], "Digable Planets", REACHIN)
+        assert ranked[0] is real
+
+    def test_ranking_drops_same_source_duplicates_keeps_both_sources(self):
+        a = ArtCandidate("X", "Album", "u1", "iTunes")
+        b = ArtCandidate("x", "album", "u2", "iTunes")
+        c = ArtCandidate("X", "Album", "u3", "Deezer")
+        ranked = rank_candidates([a, b, c], "X", "Album")
+        assert [r.art_url for r in ranked] == ["u1", "u3"]
+
+
+class _Response:
+    def __init__(self, payload):
+        self._payload = payload
+
+    def raise_for_status(self):
+        pass
+
+    def json(self):
+        return self._payload
+
+
+def _fake_get(itunes=None, deezer=None):
+    """requests.get stand-in: a payload dict, or an exception to raise."""
+    def get(url, params=None, timeout=None):
+        answer = itunes if "itunes" in url else deezer
+        if isinstance(answer, Exception):
+            raise answer
+        return _Response(answer if answer is not None else {})
+    return get
+
+
+DEEZER_REACHIN = {"data": [{"title": REACHIN,
+                            "artist": {"name": "Digable Planets"},
+                            "cover_xl": "https://dz/1000.jpg"}]}
+ITUNES_STRAY = {"results": [{"artistName": "Digable Planets",
+                             "collectionName": "Blowout Comb",
+                             "artworkUrl100": "https://it/100x100bb.jpg"}]}
+
+
+class TestSearchAlbumArt:
+    def test_deezer_only_hit_is_found_and_first(self, monkeypatch):
+        import requests
+        monkeypatch.setattr(requests, "get",
+                            _fake_get(ITUNES_STRAY, DEEZER_REACHIN))
+        found = search_album_art("Digable Planets", REACHIN)
+        assert found[0].source == "Deezer"
+        assert len(found) == 2
+
+    def test_one_source_failing_is_not_an_error(self, monkeypatch):
+        import requests
+        monkeypatch.setattr(requests, "get",
+                            _fake_get(OSError("offline"), DEEZER_REACHIN))
+        assert [c.source for c in search_album_art("Digable Planets", REACHIN)] \
+            == ["Deezer"]
+
+    def test_both_failing_raises(self, monkeypatch):
+        import requests
+        monkeypatch.setattr(requests, "get",
+                            _fake_get(OSError("a"), OSError("b")))
+        with pytest.raises(OSError):
+            search_album_art("A", "B")
+
+    def test_both_empty_is_empty(self, monkeypatch):
+        import requests
+        monkeypatch.setattr(requests, "get", _fake_get({}, {}))
+        assert search_album_art("A", "B") == []
+
+    def test_itunes_retries_with_simplified_title(self, monkeypatch):
+        terms = []
+
+        def query(term, limit):
+            terms.append(term)
+            return []
+        monkeypatch.setattr(art_search, "_itunes_query", query)
+        art_search.search_itunes("Digable Planets", REACHIN)
+        assert terms == [f"Digable Planets {REACHIN}",
+                         "Digable Planets Reachin'"]
+
+
+# ---- paste: never stage what doesn't decode ----
+
+def _png_bytes():
+    from PyQt6.QtCore import QBuffer, QIODevice
+    from PyQt6.QtGui import QImage, QColor
+    image = QImage(8, 8, QImage.Format.Format_RGB32)
+    image.fill(QColor("red"))
+    buffer = QBuffer()
+    buffer.open(QIODevice.OpenModeFlag.WriteOnly)
+    image.save(buffer, "PNG")
+    return bytes(buffer.data())
+
+
+class TestPaste:
+    def test_truncated_png_is_rejected(self, qapp):
+        from lintunes.gui.info_dialog import clipboard_image
+        mime = QMimeData()
+        mime.setData("image/png", _png_bytes()[:20])
+        assert clipboard_image(mime) is None
+
+    def test_good_png_is_accepted_raw(self, qapp):
+        from lintunes.gui.info_dialog import clipboard_image
+        mime = QMimeData()
+        png = _png_bytes()
+        mime.setData("image/png", png)
+        assert clipboard_image(mime) == (png, "image/png")
+
+    def test_local_image_file_url(self, qapp, tmp_path):
+        from lintunes.gui.info_dialog import clipboard_image
+        path = tmp_path / "cover.png"
+        path.write_bytes(_png_bytes())
+        mime = QMimeData()
+        mime.setUrls([QUrl.fromLocalFile(str(path))])
+        assert clipboard_image(mime)[1] == "image/png"
+
+    def test_bad_read_retries_then_stages_good(self, qapp, monkeypatch):
+        from lintunes.gui import info_dialog
+        square = info_dialog.ArtSquare()
+        staged, hints = [], []
+        square.art_staged.connect(lambda b, m: staged.append(b))
+        square.hint_changed.connect(hints.append)
+        bad = QMimeData()
+        bad.setData("image/png", b"\x89PNG\r\n")
+        good = QMimeData()
+        good.setData("image/png", _png_bytes())
+        reads = iter([bad, good])
+
+        class Clipboard:
+            def mimeData(self):
+                return next(reads)
+        monkeypatch.setattr(info_dialog.QApplication, "clipboard",
+                            staticmethod(lambda: Clipboard()))
+        square.paste_from_clipboard()
+        assert staged == []
+        assert hints[-1] == "Reading the clipboard…"
+        square._retry_timer.stop()
+        square._try_paste()  # what the timer would do
+        assert staged == [_png_bytes()]
+        assert hints[-1] == info_dialog.HINT_STAGED
+
+    def test_text_clipboard_says_so_without_retrying(self, qapp, monkeypatch):
+        from lintunes.gui import info_dialog
+        square = info_dialog.ArtSquare()
+        hints = []
+        square.hint_changed.connect(hints.append)
+        text = QMimeData()
+        text.setText("hello")
+        monkeypatch.setattr(info_dialog.QApplication, "clipboard",
+                            staticmethod(lambda: type(
+                                "C", (), {"mimeData": lambda self: text})()))
+        square.paste_from_clipboard()
+        assert hints == ["The clipboard doesn't hold an image"]
+        assert not square._retry_timer.isActive()
+
+    def test_stage_backstop_rejects_garbage(self, qapp):
+        from lintunes.gui.info_dialog import ArtSquare
+        square = ArtSquare()
+        staged = []
+        square.art_staged.connect(lambda b, m: staged.append(b))
+        square._stage(b"not an image", "image/jpeg")
+        assert staged == []
+
+
+# ---- multi-track Get Info carries artwork ----
+
+class TestMultiArt:
+    def test_square_visible_and_paste_embeds_everywhere(
+            self, qapp, tmp_path, mp3_file, jpeg_bytes):
+        from lintunes.gui.info_dialog import InfoDialog
+        tracks = _copies(mp3_file, tmp_path, 3)
+        manager = _manager(tmp_path, tracks)
+        dialog = InfoDialog(manager, [1, 2, 3])
+        assert not dialog._art_square.isHidden()
+        assert "mixed" in dialog._art_square.text()
+        dialog._art_square._stage(jpeg_bytes, "image/jpeg")
+        dialog._on_ok()
+        for track in tracks:
+            assert tagging.read_embedded_artwork(track.location) == jpeg_bytes
+            assert track.size > 1
+
+    def test_shared_cover_is_shown(self, qapp, tmp_path, mp3_file, jpeg_bytes):
+        from lintunes.gui.info_dialog import InfoDialog
+        tracks = _copies(mp3_file, tmp_path, 2)
+        for track in tracks:
+            tagging.write_artwork(track.location, jpeg_bytes, "image/jpeg")
+        dialog = InfoDialog(_manager(tmp_path, tracks), [1, 2])
+        assert dialog._art_square.pixmap() is not None
+        assert not dialog._art_square.pixmap().isNull()
+
+    def test_untouched_art_writes_nothing(self, qapp, tmp_path, mp3_file):
+        from lintunes.gui.info_dialog import InfoDialog
+        tracks = _copies(mp3_file, tmp_path, 2)
+        before = [open(t.location, "rb").read() for t in tracks]
+        InfoDialog(_manager(tmp_path, tracks), [1, 2])._on_ok()
+        assert [open(t.location, "rb").read() for t in tracks] == before
+        assert all(t.size == 1 for t in tracks)
+
+
+class TestEmbedHelper:
+    def test_reports_failures_and_invalidates_mpris(
+            self, qapp, tmp_path, mp3_file, jpeg_bytes, monkeypatch):
+        from lintunes.gui import art_ops
+        invalidated = []
+        monkeypatch.setattr(art_ops.mpris, "invalidate_artwork",
+                            invalidated.append)
+        [good] = _copies(mp3_file, tmp_path, 1)
+        broken = Track(track_id=2, name="Broken",
+                       location=str(tmp_path / "missing.mp3"))
+        nofile = Track(track_id=3, name="No File", location="")
+        manager = _manager(tmp_path, [good, broken, nofile])
+        done, failures = art_ops.embed_artwork(
+            manager, [good, broken, nofile], jpeg_bytes, "image/jpeg")
+        assert done == 1
+        assert len(failures) == 1 and failures[0].startswith("Broken:")
+        assert invalidated == [good]