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 help.py: Implement the Idle help menu.
Contents are subject to revision at any time, without notice.


Help => About IDLE: diplay About Idle dialog

<to be moved here from aboutDialog.py>


Help => IDLE Help: Display help.html with proper formatting.
Doc/library/idle.rst (Sphinx)=> Doc/build/html/library/idle.html
(help.copy_strip)=> Lib/idlelib/help.html

HelpParser - Parse help.html and render to tk Text.

HelpText - Display formatted help.html.

HelpFrame - Contain text, scrollbar, and table-of-contents.
(This will be needed for display in a future tabbed window.)

HelpWindow - Display HelpFrame in a standalone window.

copy_strip - Copy idle.html to help.html, rstripping each line.

show_idlehelp - Create HelpWindow.  Called in EditorWindow.help_dialog.
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    maintenance version).

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    do an update as described above, without editing idle.rst, to
    rebase help.html on the next version of idle.rst.  Do not worry
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