Set AA_ShareOpenGLContexts attribute, to fix WebEngine warning on Win…

…dows

Currently Qt WebEngine complains (as can be seen on appveyor):

  Qt WebEngine seems to be initialized from a plugin. Please set
  Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute before
  constructing QGuiApplication.

retext.py

@@ -28,7 +28,7 @@
 from ReText.window import ReTextWindow
 
 from PyQt5.QtCore import QFile, QFileInfo, QIODevice, QLibraryInfo, \
- QTextStream, QTranslator
+ QTextStream, QTranslator, Qt
 from PyQt5.QtWidgets import QApplication
 from PyQt5.QtNetwork import QNetworkProxyFactory
 
@@ -47,6 +47,9 @@ def main():
 		sys.stdout = open(devnull, 'w')
 		sys.stderr = open('stderr.log', 'w')
 
+	if hasattr(Qt, 'AA_ShareOpenGLContexts'):
+		# Needed for Qt WebEngine on Windows
+		QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
 	app = QApplication(sys.argv)
 	app.setOrganizationName("ReText project")
 	app.setApplicationName("ReText")

tests/test_editor.py

@@ -27,6 +27,8 @@
 from PyQt5.QtWidgets import QApplication
 from markups import MarkdownMarkup, ReStructuredTextMarkup
 
+if hasattr(Qt, 'AA_ShareOpenGLContexts'):
+	QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
 # Keep a reference so it is not garbage collected
 app = QApplication.instance() or QApplication(sys.argv)
 

tests/test_settings.py

@@ -30,6 +30,8 @@
 # only have one QCoreApplication instance for all tests in a process. As
 # other tests need QApplication, we should not create a bare QCoreApplication
 # here. Also, keep a reference so it is not garbage collected.
+if hasattr(Qt, 'AA_ShareOpenGLContexts'):
+	QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
 app = QApplication.instance() or QApplication(sys.argv)
 
 class TestSettings(unittest.TestCase):

tests/test_window.py

@@ -28,14 +28,16 @@
 
 from markups.abstract import ConvertedMarkup
 
-from PyQt5.QtCore import pyqtSignal, QObject
+from PyQt5.QtCore import pyqtSignal, QObject, Qt
 from PyQt5.QtWidgets import QApplication
 import ReText
 from ReText.window import ReTextWindow
 
 defaultEventTimeout = 0.0
 path_to_testdata = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'testdata')
 
+if hasattr(Qt, 'AA_ShareOpenGLContexts'):
+    QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
 app = QApplication.instance() or QApplication(sys.argv)
 ReText.initializeDataDirs()