Maintain compatibility with PyQt5 add-ons in PyQt6 builds (#1440)

* Alias PyQt5 to PyQt6 on PyQt6 builds

Restores basic compatibility with PyQt5 add-ons

* Register QtCore early to work around sip error

* Monkey-patch unscoped enums that are in use by add-ons back in

Enums whose namespace moved with PyQt6 were determined using the tooling in https://github.com/qutebrowser/qutebrowser/issues/5904

Relevant enums for the Anki add-on ecosystem were found by grepping through all AnkiWeb add-ons and a selection of GitHub-released add-ons.

* Add full Qt.Key namespace

Maintains compatibility with add-ons that allow specifying key bindings via Qt.Key enums

* Reintroduce PyQt6.Qt as an alias for QtCore.Qt

* Alias classes shifted from QtWidgets to QtGui

* Add missing enums

Adds ≈200 enums that were missed during the initial grep

* Map exec_ calls to exec

* Tweak section headers

* Fix QtWebEngineWidgets imports failing due to delayed import

Addesses: "QtWebEngineWidgets must be imported before a QCoreApplication instance is created"

* Register additional aliases for top-level Qt modules

Given how we have had to deal with side-effects when not registering other aliased imports ahead of time, it seems safer to also register the remaining few with sys.modules.

* Handle calls to deprecated PyQt resource API graciously

* Create QtWebEngineWidgets aliases for classes moved to QtWebEngineCore

* Alias QShortcut

* Restore QWebEnginePage.view()

* Alias sip to PyQt6.sip

* Alias QtCore.QRegExp to QtCore.QRegularExpression

* Restructure aqt.qt into package

Pre-requirement for aliasing the PyQt5.Qt namespace correctly.

Should hopefully also make it easier to keep an overview as Qt-compat-related modules were proliferating.

* Properly alias PyQt5.Qt

PyQt5.Qt used to serve as a common namespace for all Qt classes, not just QtCore.Qt.*

While this changes does not make all classes accessible via PyQt5.Qt, it does so for the most important Qt submodules, which should cover most add-on breakages.

* Simplify Qt resource system legacy handling

* Also alias PyQt6.Qt

Covers imports of the form `from PyQt5 import import Qt` (due to previous aliasing of PyQt5 to PyQt6)

* Add missing enums

Better approach to grepping through add-ons yielded additional hits

* Run formatters

* Satisfy pylint

qt/aqt/qt/__init__.py

@@ -10,33 +10,10 @@ import traceback
 from typing import Callable, Union
 
 try:
-    from PyQt6 import sip
-    from PyQt6.QtCore import *
-
-    # conflicting Qt and qFuzzyCompare definitions require an ignore
-    from PyQt6.QtGui import *  # type: ignore[misc]
-    from PyQt6.QtNetwork import QLocalServer, QLocalSocket, QNetworkProxy
-    from PyQt6.QtWebChannel import QWebChannel
-    from PyQt6.QtWebEngineCore import *
-    from PyQt6.QtWebEngineWidgets import *
-    from PyQt6.QtWidgets import *
+    from . import compat  # needs to be imported first
+    from .qt6 import *
 except:
-    from PyQt5.QtCore import *  # type: ignore
-    from PyQt5.QtGui import *  # type: ignore
-    from PyQt5.QtNetwork import (  # type: ignore
-        QLocalServer,
-        QLocalSocket,
-        QNetworkProxy,
-    )
-    from PyQt5.QtWebChannel import QWebChannel  # type: ignore
-    from PyQt5.QtWebEngineCore import *  # type: ignore
-    from PyQt5.QtWebEngineWidgets import *  # type: ignore
-    from PyQt5.QtWidgets import *  # type: ignore
-
-    try:
-        from PyQt5 import sip  # type: ignore
-    except ImportError:
-        import sip  # type: ignore
+    from .qt5 import *  # type: ignore
 
 from anki.utils import isMac, isWin
 

qt/aqt/qt/qt5.py

@@ -0,0 +1,22 @@
+# Copyright: Ankitects Pty Ltd and contributors
+# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+# make sure not to optimize imports on this file
+# pylint: skip-file
+
+"""
+PyQt5 imports
+"""
+
+from PyQt5.QtCore import *  # type: ignore
+from PyQt5.QtGui import *  # type: ignore
+from PyQt5.QtNetwork import QLocalServer, QLocalSocket, QNetworkProxy  # type: ignore
+from PyQt5.QtWebChannel import QWebChannel  # type: ignore
+from PyQt5.QtWebEngineCore import *  # type: ignore
+from PyQt5.QtWebEngineWidgets import *  # type: ignore
+from PyQt5.QtWidgets import *  # type: ignore
+
+try:
+    from PyQt5 import sip  # type: ignore
+except ImportError:
+    import sip  # type: ignore

qt/aqt/qt/qt5extra.py

@@ -13,9 +13,9 @@ from typing import cast
 
 import aqt
 
-from .qt import *
-from .sound import Recorder
-from .utils import showWarning
+from . import *  # isort:skip
+from ..sound import Recorder  # isort:skip
+from ..utils import showWarning  # isort:skip
 
 
 class QtAudioInputRecorder(Recorder):

qt/aqt/qt/qt5qt.py

@@ -0,0 +1,17 @@
+# Copyright: Ankitects Pty Ltd and contributors
+# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+# make sure not to optimize imports on this file
+# pylint: skip-file
+
+"""
+Compatibility shim for PyQt5.Qt
+"""
+
+from typing import Any
+
+from .qt5 import *
+
+
+def __getattr__(name: str) -> Any:
+    return getattr(Qt, name)  # type: ignore

qt/aqt/qt/qt6.py

@@ -0,0 +1,20 @@
+# Copyright: Ankitects Pty Ltd and contributors
+# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+# make sure not to optimize imports on this file
+# pylint: disable=unused-import
+
+"""
+PyQt6 imports
+"""
+
+from PyQt6 import sip
+from PyQt6.QtCore import *
+
+# conflicting Qt and qFuzzyCompare definitions require an ignore
+from PyQt6.QtGui import *  # type: ignore[misc]
+from PyQt6.QtNetwork import QLocalServer, QLocalSocket, QNetworkProxy
+from PyQt6.QtWebChannel import QWebChannel
+from PyQt6.QtWebEngineCore import *
+from PyQt6.QtWebEngineWidgets import *
+from PyQt6.QtWidgets import *

qt/aqt/sound.py

@@ -671,7 +671,7 @@ class RecordDialog(QDialog):
                 namedtmp("rec.wav"), self.mw, self._parent
             )
         else:
-            from .qt5 import QtAudioInputRecorder as Qt5Recorder
+            from aqt.qt.qt5extra import QtAudioInputRecorder as Qt5Recorder
 
             self._recorder = Qt5Recorder(namedtmp("rec.wav"), self.mw, self._parent)
         self._recorder.start(self._start_timer)