Add workaround for black screen with QtWebEngine

Fixes #2441

CHANGELOG.asciidoc

@@ -28,6 +28,12 @@ Changed
 - When using QtWebEngine, the underlying Chromium version is now shown in the
   version info.
 
+Fixed
+~~~~~
+
+- Added a workaround for a black screen with QtWebEngine with some setups
+  (requires PyOpenGL to be installed)
+
 v0.10.1
 -------
 

qutebrowser/browser/webengine/webenginesettings.py

@@ -25,6 +25,7 @@ Module attributes:
 """
 
 import os
+import logging
 
 # pylint: disable=no-name-in-module,import-error,useless-suppression
 from PyQt5.QtWebEngineWidgets import (QWebEngineSettings, QWebEngineProfile,
@@ -33,7 +34,7 @@ from PyQt5.QtWebEngineWidgets import (QWebEngineSettings, QWebEngineProfile,
 
 from qutebrowser.browser import shared
 from qutebrowser.config import config, websettings
-from qutebrowser.utils import objreg, utils, standarddir, javascript
+from qutebrowser.utils import objreg, utils, standarddir, javascript, log
 
 
 class Attribute(websettings.Attribute):
@@ -159,6 +160,18 @@ def init(args):
     if args.enable_webengine_inspector:
         os.environ['QTWEBENGINE_REMOTE_DEBUGGING'] = str(utils.random_port())
 
+    # Workaround for a black screen with some setups
+    # https://github.com/spyder-ide/spyder/issues/3226
+    if not os.environ.get('QUTE_NO_OPENGL_WORKAROUND'):
+        # Hide "No OpenGL_accelerate module loaded: ..." message
+        logging.getLogger('OpenGL.acceleratesupport').propagate = False
+        try:
+            from OpenGL import GL
+        except ImportError:
+            pass
+        else:
+            log.misc.debug("Imported PyOpenGL as workaround")
+
     profile = QWebEngineProfile.defaultProfile()
     _init_profile(profile)
     _init_stylesheet(profile)