On GNU/Linux:
The highlit area flickers. On W32 it flickers once when the tooltip
pops up, but on X, it flickers constantly. I remember fixing something
like this on W32 years ago, it was in the code that detected mouse
movement - movement events were being sent for zero movement when
inside track-mouse forms. But my recollection is that the same bug did
not appear on X at the time, so even though the code appeared to be
the same, I did not try to apply my fix to the X code.
If C-c c is pressed before the tooltip pops up, nothing happens until
the tooltip-delay expires, then the tooltip flashes up for a brief
instant and the buffer switch takes place.
Both problems I saw on GNU/Linux appear in both the header-line and
mode-line.
Can anyone else reproduce this?
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