v0.51.1: album art sits under the list frame's closing line, like the empty panel

tests/test_round80.py

@@ -138,6 +138,7 @@ def test_no_art_panel_sits_below_the_frame(qapp, tmp_path):
 
 def test_real_art_goes_inside_the_frame(qapp, tmp_path):
     from PyQt6.QtGui import QPixmap
+    from lintunes.gui.sidebar import ART_RULE
     window, sidebar = _sidebar(qapp, tmp_path)
     art = sidebar.art
     pixmap = QPixmap(10, 10)
@@ -146,7 +147,7 @@ def test_real_art_goes_inside_the_frame(qapp, tmp_path):
     art.has_art_changed.emit(True)
     art._fit_height()
     assert art.parentWidget() is sidebar.list_area
-    assert art.height() == art.width()
+    assert art.height() == art.width() + ART_RULE
     art._pixmap = None
     art.set_track(None)
     assert art.parentWidget() is sidebar