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#1546 Menubar redisplay glitches on X
Most Tk widgets handle <Expose> events by drawing into
a background pixmap and blitting the results to the
screen, for a quick refresh.
The [menu] widget does not; instead it draws directly
to the window. This leads to a "blinking" effect when
e.g., mousing over menu items or keyboard navigation.
This is most noticeable on slow displays.
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I should add that I observed this effect on an 25 Mhz SGI Indigo; on modern hardware it's not really noticeable.
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This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
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Reported on the chat that this is apparently still a problem, even on modern hardware (Pentium 4 2.80 GHz and the latest Ubuntu with the Nvidia binary drivers for 3D; using a nondefault setting for *font seems to exacerbate it:
*font: -*-fixed-*-*-*-*-18-*-*-*-*-*-iso8859-*
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Maybe dealing with 1783474 will make this go away too.