Disable full screen on Windows with OpenGL (#1715)

ftl/core/actions.ftl

@@ -53,6 +53,7 @@ actions-previous-card-info = Previous Card Info
 # By convention, the name of a menu action is suffixed with "..." if additional
 # input is required before it can be performed. E.g. "Export..." vs. "Delete".
 actions-with-ellipsis = { $action }...
+actions-currently-unsupported = This action is currently not supported on your system.
 
 ## Flags
 

proto/anki/links.proto

@@ -30,6 +30,7 @@ message HelpPageLinkRequest {
     CUSTOMIZING_FIELDS = 14;
     DECK_OPTIONS = 15;
     EDITING_FEATURES = 16;
+    FULL_SCREEN_ISSUE = 17;
   }
   HelpPage page = 1;
 }

qt/aqt/main.py

@@ -66,6 +66,7 @@ from aqt.utils import (
     checkInvalidFilename,
     current_window,
     disable_help_button,
+    disallow_full_screen,
     getFile,
     getOnlyText,
     openHelp,
@@ -1273,8 +1274,17 @@ title="{}" {}>{}</button>""".format(
     ##########################################################################
 
     def on_toggle_full_screen(self) -> None:
-        window = self.app.activeWindow()
+        if disallow_full_screen():
-        window.setWindowState(window.windowState() ^ Qt.WindowState.WindowFullScreen)
+            showWarning(
+                tr.actions_currently_unsupported(),
+                parent=self,
+                help=HelpPage.FULL_SCREEN_ISSUE,
+            )
+        else:
+            window = self.app.activeWindow()
+            window.setWindowState(
+                window.windowState() ^ Qt.WindowState.WindowFullScreen
+            )
 
     # Auto update
     ##########################################################################

qt/aqt/utils.py

@@ -852,6 +852,23 @@ def qtMenuShortcutWorkaround(qmenu: QMenu) -> None:
 ######################################################################
 
 
+def disallow_full_screen() -> bool:
+    """Test for OpenGl on Windows, which is known to cause issues with full screen mode.
+    On Qt6, the driver is not detectable, so check if it has been set explicitly.
+    """
+    from aqt import mw
+    from aqt.profiles import VideoDriver
+
+    return is_win and (
+        (qtmajor == 5 and mw.pm.video_driver() == VideoDriver.OpenGL)
+        or (
+            qtmajor == 6
+            and not os.environ.get("ANKI_SOFTWAREOPENGL")
+            and os.environ.get("QT_OPENGL") != "software"
+        )
+    )
+
+
 def add_ellipsis_to_action_label(*actions: QAction) -> None:
     """Pass actions to add '...' to their labels, indicating that more input is
     required before they can be performed.

rslib/src/links.rs

@@ -29,6 +29,7 @@ impl HelpPage {
             HelpPage::CustomizingFields => "editing.html#customizing-fields",
             HelpPage::DeckOptions => "deck-options.html",
             HelpPage::EditingFeatures => "editing.html#editing-features",
+            HelpPage::FullScreenIssue => "platform/windows/display-issues.html#full-screen",
         }
     }
 }