[issue25198] Idle: improve idle.html help viewer.

[Terry J. Reedy]

Terry J. Reedy added the comment:

By reading http://www.tcl.tk/man/tcl8.6/TkCmd/text.htm I discovered that Text.yview(index) puts the line with index at the top of the windows, given enough line below to fill the window.  This fixes another glitch.

Still left: the original 3 items (msg251181), navigating the text with up and down arrow (msg251571), and operating TOC button with keyboard (msg251556).

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Added file: http://bugs.python.org/file40595/top-of-window.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25198>
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