If "xemacs -vanilla" (21.5-b11 or 21.4.12) is run with the following X
You see all sorts of display cruft along the outer edges of the frame.
Random grey lines appear frequently when listing completions and
aborting out of completion listing commands. For example,
C-x C-f <space>
results in a grey line drawn along the bottommost pixel or two of the
frame (under the minibuffer). If I then do:
I'm left with a short vertical grey bar along the left edge of the
frame where the modeline was for the split window when showing
completions. This is not completely deterministic, sometimes
everything is fine, other times the vertical bar extends along the
whole extent of what was the upper window.
If I load a file (C-x C-f) and then kill the buffer (C-x k <RET>) then
the entire left edge of the frame has a two pixel wide vertical grey
line. C-l clears it.
I can send screenshots if anyone is interested.
The bug does not appear in 21.4.6 (as distributed with RH 7.3).
The problems show whether or not the buffers-tab is on or off, though
I suspect has something to do with that code or the code supporting