From: NRK <nrk@disroot.org>
Date: Fri, 25 Mar 2022 21:51:45 +0000 (+0100)
Subject: avoid redraw when there's no change
X-Git-Url: https://git.xinqibao.xyz/dmenu.git/commitdiff_plain/6818e07291f3b2913e687c8ec3d3fe4711724050?hp=6818e07291f3b2913e687c8ec3d3fe4711724050

avoid redraw when there's no change

while i was timing the performance issue, i noticed that there was lots
of random redrawing going on.

turns out there were coming from here; if someone presses CTRL/ALT etc
without pressing anything else, nothing will be inserted, so nothing
will change. but the code will `break`, go down and do a needless redraw.

this patch changes it to simply return if the keypress iscntrl()

also avoid potential UB by casting *buf into an unsigned char.
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