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bug#17497: 24.4.50; TTY menu glitches


From: Eli Zaretskii
Subject: bug#17497: 24.4.50; TTY menu glitches
Date: Fri, 16 May 2014 11:48:42 +0300

> From: Glenn Morris <address@hidden>
> Cc: Dmitry Antipov <address@hidden>,  address@hidden
> Date: Fri, 16 May 2014 02:53:59 -0400
> 
> And with the same strategy under "XTerm(303)", I quickly got the attached.
> I don't normally use xterm, though, and it must be misconfigured
> somehow, because pressing "M-x" produces LATIN SMALL LETTER O WITH
> STROKE... :)

I have no idea what causes this.  I cannot reproduce this, neither on
Windows, nor when running Emacs on GNU/Linux via PuTTY (which emulates
xterm).

Does this problem go away if you enlarge the terminal window such that
the entire File and Tools menus can be displayed without overlaying
the mode line?  If the problems disappear then, perhaps we could solve
them by limiting the number of displayed menu items some more.

If enlarging the window doesn't help, then I don't know what to do,
unless someone shows me a recipe I can use to reproduce the problem on
some machine where I can debug them.  Failing that, perhaps some
terminfo expert could analyze the termscript and show what we do
wrongly.  Last time I looked at termscript produced in a similar case,
it looked entirely legitimate, i.e. at no time did Emacs send a
terminal command to write to the portions of display where a
screenshot showed incorrectly displayed text, and every time a
red-background menu item was incorrectly left behind, there was a
clear command in the termscript that told the terminal to redraw that
very item with the normal (blue) background.  IOW, it looked like for
some reason the terminal was not obeying the commands it was sent.
Doers anyone know why would this happen?

It could also be some timing problem, specific to X, in which case
someone will have to explain how to avoid that, because I have no
idea.

Does this happen if you use the menu "reasonably", i.e. without
leaning on arrow keys?  Does it happen if you use C-p instead of the
down arrow?

I'm at a loss here...





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