Python syntax highlighter can crash when Script has syntax errors

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

Launch ParaView Add Python View Enter some text in the Script text entry Click outside the text entry Click back inside the text entry and modify the text ParaView will crash

Partial stack track is:

frame #0: 0x0000000107fb3f5f PythonPyUnicodeUCS2_AsUTF8String + 4 frame #1: 0x0000000100b4ce85 libvtkpqPython-pv5.1.1.dylibpqPythonSyntaxHighlighter::rehighlightSyntax(this=0x00000001168210a0) + 1637 at pqPythonSyntaxHighlighter.cxx:193 frame #2: 0x0000000100b4f5e2 libvtkpqPython-pv5.1.1.dylibpqPythonSyntaxHighlighter::qt_static_metacall(_o=0x00000001168210a0, _c=InvokeMetaMethod, _id=0, _a=0x00007fff5fbfdd80) + 130 at moc_pqPythonSyntaxHighlighter.cxx:49 frame #3: 0x00000001072e3c2e QtCoreQMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 1566

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