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bug#47207: 28.0.50; decode_next_window_args crash


From: Eli Zaretskii
Subject: bug#47207: 28.0.50; decode_next_window_args crash
Date: Wed, 17 Mar 2021 15:29:32 +0200

> From: martin rudalics <rudalics@gmx.at>
> Date: Wed, 17 Mar 2021 09:45:21 +0100
> Cc: Alan Mackenzie <acm@muc.de>
> 
> The following bug has hit me out of the blue a couple of times.  Trying
> to ediff two buffers gets me the crash below:
> 
> 
> #0  0x00000000005a5f85 in terminate_due_to_signal (sig=6, 
> backtrace_limit=2147483647) at ../../src/emacs.c:379
> #1  0x0000000000651df0 in die (msg=0x788ee1 "WINDOWP (a)", file=0x788ece 
> "../../src/window.h", line=543) at ../../src/alloc.c:7420
> #2  0x00000000004bdca6 in XWINDOW (a=XIL(0)) at ../../src/window.h:543
> #3  0x00000000004c6a4d in decode_next_window_args (window=0x7fffffffa808, 
> minibuf=0x7fffffffa800, all_frames=0x7fffffffa7f8) at ../../src/window.c:2891
> #4  0x00000000004c6bff in next_window (window=XIL(0x2b04405), minibuf=XIL(0), 
> all_frames=XIL(0x30), next_p=true) at ../../src/window.c:2927

Do you have local changes in window.c?  The line numbers are about 200
lines off the current sources.

> we probably should decide whether to consider tooltip windows in
> `next-window' or `other-window' at all.

Not sure why.  Don't we envision some applications that would like to
examine tooltip windows?  IOW, that tooltip frames don't have a
minibuffer doesn't necessarily mean we don't want to give window
iterations access to tooltip windows.





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