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new feature: add a search facility to the help viewer
Rishabh Dave authored
Allow the user to search in a help text with ^W and M-W.

Achieve this by not writing the help text directly to the screen
but first writing it to a temporary file and then opening this file
in a new buffer, and treating it specially: the normal file-reading
feedback is suppressed, the titlebar shows the headline of the text,
the cursor is hidden, and the menu is limited to just the up and down
movements and searching.

This fulfills https://savannah.gnu.org/bugs/?28994

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Signed-off-by: default avatarRishabh Dave <rishabhddave@gmail.com>
90bd25c1
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