...

src/calibre/gui2/metadata/single_download.py

@@ -30,7 +30,6 @@ from calibre.ebooks.metadata.book.base import Metadata
 from calibre.gui2 import error_dialog, NONE
 from calibre.utils.date import utcnow, fromordinal, format_date
 from calibre.library.comments import comments_to_html
-from calibre.constants import islinux
 from calibre import force_unicode
 # }}}
 
@@ -117,12 +116,10 @@ class CoverDelegate(QStyledItemDelegate): # {{{
 
     def paint(self, painter, option, index):
         QStyledItemDelegate.paint(self, painter, option, index)
-        if islinux:
-            # On linux for some reason the selected color is drawn on top of
-            # the decoration
-            style = QApplication.style()
-            style.drawItemPixmap(painter, option.rect, Qt.AlignTop|Qt.AlignHCenter,
-                QPixmap(index.data(Qt.DecorationRole)))
+        # Ensure the cover is rendered over any selection rect
+        style = QApplication.style()
+        style.drawItemPixmap(painter, option.rect, Qt.AlignTop|Qt.AlignHCenter,
+            QPixmap(index.data(Qt.DecorationRole)))
         if self.timer.isActive() and index.data(Qt.UserRole).toBool():
             rect = QRect(0, 0, self.spinner_width, self.spinner_width)
             rect.moveCenter(option.rect.center())

src/calibre/gui2/preferences/__init__.py

@@ -337,7 +337,13 @@ def show_config_widget(category, name, gui=None, show_restart_msg=False,
     bb.button(bb.RestoreDefaults).setEnabled(w.supports_restoring_to_defaults)
     bb.button(bb.Apply).setEnabled(False)
     bb.button(bb.Apply).clicked.connect(d.accept)
-    w.changed_signal.connect(lambda : bb.button(bb.Apply).setEnabled(True))
+    def onchange():
+        b = bb.button(bb.Apply)
+        b.setEnabled(True)
+        b.setDefault(True)
+        b.setAutoDefault(True)
+    w.changed_signal.connect(onchange)
+    bb.button(bb.Cancel).setFocus(True)
     l = QVBoxLayout()
     d.setLayout(l)
     l.addWidget(w)