v0.44.1: Preferences headings stay bold under the app's style sheet

The headings were set with setFont, which the app's own style sheet
(theme.apply_theme) overrides on re-polish — bold in a bare dialog, plain
in the running app. A style sheet on the heading itself wins. The test now
applies the theme first, as the app does.

lintunes/__init__.py

@@ -1,3 +1,3 @@
 """LinTunes — iTunes-style music library manager and player for Linux."""
 
-__version__ = "0.44.0"
+__version__ = "0.44.1"

lintunes/gui/preferences_dialog.py

@@ -191,10 +191,9 @@ class PreferencesDialog(QDialog):
         the UI size changes, since the app font moves with it."""
         size = QFontInfo(QApplication.font()).pixelSize() + HEADING_EXTRA_PX
         for header in self._headings:
-            font = QFont(QApplication.font())
-            font.setPixelSize(size)
-            font.setBold(True)
-            header.setFont(font)
+            # A style sheet, not setFont: the app's own style sheet (theme)
+            # re-polishes widgets and would quietly put the plain font back.
+            header.setStyleSheet(f"font-weight: bold; font-size: {size}px;")
 
     def _show_page(self, row: int):
         self.pages.setCurrentIndex(row)

tests/test_round79.py

@@ -161,14 +161,19 @@ def _prefs_dialog(prefs):
 
 class TestHeadings:
     def test_bold_and_two_px_larger(self, qapp, tmp_path):
-        dialog = _prefs_dialog(Preferences(tmp_path))
+        from lintunes import theme
+        prefs = Preferences(tmp_path)
+        theme.apply_theme(QApplication.instance(), prefs)   # as the app runs
+        dialog = _prefs_dialog(prefs)
+        dialog.show()
         text_px = QFontInfo(QApplication.font()).pixelSize()
         headings = dialog.findChildren(QLabel, "prefs-heading")
         assert {h.text() for h in headings} >= {"Interface", "Visualizer",
                                                  "Colors", "Last.fm"}
         for heading in headings:
             assert heading.font().bold()
-            assert heading.font().pixelSize() == text_px + 2
+            assert QFontInfo(heading.font()).pixelSize() == text_px + 2
+        dialog.close()
 
     def test_the_boxes_contents_stay_plain(self, qapp, tmp_path):
         dialog = _prefs_dialog(Preferences(tmp_path))