Message 64340 - Python tracker

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Content
Hi,

This patch makes Help dialog executes as nonmodal. I added a new button
at textView.py to demonstrate the behavior, also, I created a decorator
called _singledialog at EditorWindow so just one Help window executes at
a time, trying to start a new brings the current one to the front.

I hope this issue is not totally dead, so someone could review and
possible apply.