Python syntax highlighter ctor highlights text

This is so that the text loaded into the text area (i.e. from the
ParaView state file) will have syntax highlighting before the user edits
the text area.

Change-Id: Id97501f26fad8aa56afc5fe28e34ce0ec1fada15
Add unicode character support in the syntax highlighter

Change-Id: Id6899c2c4e859d12ddc7e9f682e716f234994348
Merge topic 'python_syntax_highlighting_bugs' into next

93e58e61 Add unicode character support in the syntax highlighter
47fc5414 Python syntax highlighter ctor highlights text