The hold machinery remembers whether the keyboard was up when the first
hold was taken, so releasing the last hold restores rather than clobbers
it. Across a lock that restore is wrong: the keyboard was up because of
something being typed before the phone went down, and the first thing
you see on unlocking is a keyboard sitting over whatever you came back
for.
Intent to type does not survive the screen going away. Anything that
still wants the keyboard — a field taking focus again — asks for it, on
the path that already works.
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