GNU bug report logs - #74496
30.0.91; fullscreen frame set with F11 is shifted when ctwm restarts

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From: martin rudalics <rudalics <at> gmx.at>
To: Van Ly <van.ly <at> SDF.ORG>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 74496 <at> debbugs.gnu.org
Subject: bug#74496: 30.0.91; fullscreen frame set with F11 is shifted when ctwm restarts
Date: Wed, 4 Dec 2024 10:52:37 +0100

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>    33  (gdb) condition 1 lval == Qnil
>    34  No symbol "builtin_lisp_symbol" in current context.

I see.  The condition would have been

  condition 1 EQ (lval, Qnil)

but lval is not a C variable.  So it won't work without modifying the
source.  I have no good idea yet how to do that.  Setting these
breakpoints unconditionally is out of the question - we want to catch
the transition from Qfullboth to Qnil here.

Maybe you can try the attached diff (it's against the release version)
and set breakpoints at the four lines I marked with a

// break-here

comment.  Start gdb via run -Q, do F11 and restart CWTM.  Here you have
to switch to the debugging Emacs (either you have it on another
workspace or you find an equivalent of Alt-TAB used by most window
managers) type "bt" and post the backtrace here.  Maybe it will let us
find out why that parameter gets reset.

martin

[break-fullscreen.diff (text/x-patch, attachment)]

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