[issue34976] IDLE: Replace the search dialog with a search bar

[Tal Einat]

Tal Einat <taleinat+python at gmail.com> added the comment:

> Why would having all 'a's on a page light up when I type 'a' be a plus?

The auto-highlighting could be disabled for 1-2 character search queries, or delayed for a bit to allow typing to continue.

I find auto-highlighting very useful when I'm looking for "where is this variable used?", I just Ctrl-f, start typing its name, and get the answer very quickly, even if I haven't typed the whole name.

Also, this PR supports Alt+/ completion in the search bar, which makes the above even more effective.

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<https://bugs.python.org/issue34976>
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