We should no longer need blank painting for cover browser on startup

src/calibre/gui2/cover_flow.py

@@ -14,8 +14,7 @@ import sys
 import time
 from qt.core import (
     QAction, QApplication, QDialog, QFont, QImage, QItemSelectionModel, QKeySequence,
-    QLabel, QPainter, QPalette, QSize, QSizePolicy, QStackedLayout, Qt, QTimer,
-    pyqtSignal,
+    QLabel, QSize, QSizePolicy, QStackedLayout, Qt, QTimer, pyqtSignal,
 )
 
 from calibre.constants import islinux
@@ -23,7 +22,6 @@ from calibre.ebooks.metadata import authors_to_string, rating_to_stars
 from calibre.gui2 import config, gprefs, rating_font
 from calibre_extensions import pictureflow
 
-
 MIN_SIZE = QSize(300, 150)
 
 
@@ -190,32 +188,6 @@ class CoverFlow(pictureflow.PictureFlow):
 
     dc_signal = pyqtSignal()
     context_menu_requested = pyqtSignal()
-    _ignore_paint_events = False
-
-    @property
-    def ignore_paint_events(self):
-        return self._ignore_paint_events
-
-    @ignore_paint_events.setter
-    def ignore_paint_events(self, val):
-        if val != self._ignore_paint_events:
-            self._ignore_paint_events = val
-            if not val:
-                self.update()
-
-    def paintEvent(self, ev):
-        if self.ignore_paint_events and time.monotonic() - self.created_at < 1:
-            # Paint blank during startup to avoid flashing
-            p = QPainter(self)
-            p.fillRect(self.rect(), self.palette().color(QPalette.ColorRole.Window))
-            p.end()
-        else:
-            super().paintEvent(ev)
-
-    def resizeEvent(self, ev):
-        if ev.oldSize() == QSize(-1, -1):
-            self.created_at = time.monotonic()
-        super().resizeEvent(ev)
 
     def __init__(self, parent=None):
         pictureflow.PictureFlow.__init__(self, parent,