Message 152659 - Python tracker

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Content 
Attached is a reworked patch to handle the nonmodal help dialog.

It replaces the decorator _singledialog with a call to a singleton HelpDialog class. The class creates the textView widget using as its parent the root Tk window instance instead of the EditorWindow's Toplevel.
Any EditorWindow instance calling "help_dialog" will cause the existing help dialog to be repositioned on top of it.