So I noticed that searching for messages feels "buggy". I dove into the
code and gave it a pretty nice refresh, I know you'll like it once you
try it!
Some of the issues I noticed and are now fixed:
* The search doesn't clear immediately when you clear the text box, it's
delayed like everything else. This also has the knock-on effect of
starting random network requests.
* If you now press the search button (either with a mouse, pen, etc. or
by the keyboard) the search delay timer was still running.
* The "nothing is here" placeholder message appears when the search
timer is running, making you think no messages were found.
These changes also help other places where SearchPage is used, not just
message search.
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