Summoning on onPressed meant any gesture that merely began over the search
field raised the keyboard — including the swipe that scrolls the app grid,
which starts at the top of the drawer more often than not. The press now only
remembers where it landed and the release decides, with a generous slop: a
thumb reaching the top of a 540px panel is not steady, and a few pixels of
drift while tapping a text field is a tap.
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