From: "Bruno Félix Rezende Ribeiro" <oitofelix@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 18912@debbugs.gnu.org
Subject: bug#18912: 24.4; mode-line corruption on graphical frames in dual-headed display
Date: Mon, 03 Nov 2014 18:06:28 -0200 [thread overview]
Message-ID: <5457E044.9080300@gnu.org> (raw)
In-Reply-To: <83ppd4w910.fsf@gnu.org>
[-- Attachment #1.1: Type: text/plain, Size: 4639 bytes --]
Eli Zaretskii wrote:
> I'd like to solve this problem, not paper over it. I hope you agree
> that solving it is better than working around it.
Sure, given that it's practical to solve.
> I find it hard to believe that we won't find the root cause, so I
> think we don't need to consider that possibility.
I'm glad to hear it! I'll do whatever I can to help you figure this
out. :-)
> Here are the first instructions to get information that will help us
> start digging into this. (These are in addition to what Martin
> already requested.)
I've replied to Martin's request already.
> First, please build Emacs without optimizations and with extra
> checking code enabled:
>
> CFLAGS='-O0 -g3' ./configure --prefix=/home/felix/opt/emacs-24.4 --with-x-toolkit=athena --enable-checking='yes,glyphs'
>
> (I only care about CFLAGS and the --enable-checking= option; the rest
> I just copied from your original report, but feel free to change them
> if you want. The --enable-checking= option is required to compile the
> dump-glyph-matrix command I ask you to use below.)
Here is what Emacs says about the configuration step:
Configured using:
`configure --prefix=/home/felix/opt/emacs-24.4-debug
--with-x-toolkit=athena --enable-checking=yes,glyphs 'CFLAGS=-O0 -g3''
I did a VPATH build, though.
> After 'configure' finishes, invoke "make". You don't have to invoke
> "make install", as Emacs can be run from the src/ directory where it
> was built.
I did that: ran it right away from the build directory.
> Now start Emacs you've just build with "emacs -Q", type the "C-x d"
> command that you say is sufficient to reproduce the problem, and then
> type this:
>
> M-x dump-glyph-matrix RET
>
> This outputs to the standard error stream the description of the
> internal data structure, called "glyph matrix", which Emacs maintains
> for each window on a GUI frame. Please post that output (you may wish
> to redirect stderr to a file when you invoke Emacs, to make that
> easier).
>
> Please do this once for the "good" configuration, and another time for
> the "bad" configuration, but please make sure you invoke Emacs the
> same in both cases and type the same "C-x d" command in each case.
The outputs of the 'dump-glyph-matrix' command for both the good and bad
configurations are in the attached files 'dump-glyph-matrix-good.txt'
and 'dump-glyph-matrix-bad.txt', respectively; they are identical, though.
> Next, in the "bad" configuration and with the listing of /dev and
> corrupted mode line displayed, type this:
>
> M-: (setq frame-resize-pixelwise t) RET
>
> Now carefully decrease the frame's height by dragging its upper or
> lower edge with the mouse. Please drag it slowly and carefully, so
> that the frame is resized one pixel at a time. After each resize,
> please see if the mode line is no longer corrupted. Perhaps kill the
> buffer and type "C-x d" again to make sure the corruption disappeared
> for good. The first time the mode line stops being corrupted, type
>
> M-x dump-glyph-matrix RET
>
> again, and include this (3rd) output in your message. Also, please
> tell how many pixels did you subtract from the original frame height
> before the corruption disappeared (assuming it ever does).
For the sake of precision I used the method suggested by Martin:
evaluating the expression
(while (y-or-n-p "decrease?")
(set-frame-height nil (1- (frame-text-height)) nil t))
in the requested condition. In order to not be fooled by a spurious
mode-line redrawing, I killed the buffer and invoked 'C-x d /dev RET'
again and the glitch was gone, after one iteration (minus 1 pixel). The
output of the command 'dump-glyph-matrix' is in the attached file named
'dump-glyph-matrix-bad-resized.txt'. This one is different from the
other two.
Then, to be sure I executed immediately the inverse procedure by
evaluating the expression
(while (y-or-n-p "increase?")
(set-frame-height nil (1+ (frame-text-height)) nil t))
and therefore incrementing the frame's height by 1 pixel. After killing
and getting again to the Dired buffer, the glitch was back.
> Where are the instructions to use the debugger, you ask? Well, not
> yet, but maybe after we see what the above tells us.
I'm waiting for further instructions. :-P
--
,= ,-_-. =. Bruno Félix Rezende Ribeiro (oitofelix) [0x28D618AF]
((_/)o o(\_)) There is no system but GNU;
`-'(. .)`-' GNU Linux-Libre is one of its official kernels;
\_/ All software must be free as in freedom;
[-- Attachment #1.2: dump-glyph-matrix-bad.txt --]
[-- Type: text/plain, Size: 3639 bytes --]
PT = 214, BEGV = 1. ZV = 10370
Cursor x = 468, y = 72, hpos = 52, vpos = 4
=============================================
0: (1) ''
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[-- Attachment #1.3: dump-glyph-matrix-bad-resized.txt --]
[-- Type: text/plain, Size: 3687 bytes --]
PT = 214, BEGV = 1. ZV = 10370
Cursor x = 468, y = 72, hpos = 52, vpos = 4
=============================================
0: (1) ''
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9: (1) ' crw------- 1 root root 10, 234 Out 30 22:17 btrfs-control[\n]'
9: (1) ''
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[-- Attachment #1.4: dump-glyph-matrix-good.txt --]
[-- Type: text/plain, Size: 3639 bytes --]
PT = 214, BEGV = 1. ZV = 10370
Cursor x = 468, y = 72, hpos = 52, vpos = 4
=============================================
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0: (1) ' /dev:[\n]'
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29: (1) ''
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29: (1) ''
30: (1) ''
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30: (1) ''
31: (1) ''
31: (1) ' crw------- 1 root root 10, 228 Out 30 22:18 hpet[\n]'
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[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]
next prev parent reply other threads:[~2014-11-03 20:06 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 13:46 bug#18912: 24.4; mode-line corruption on graphical frames in dual-headed display Bruno Félix Rezende Ribeiro
2014-10-31 20:30 ` Stefan Monnier
2014-10-31 20:44 ` Bruno Félix Rezende Ribeiro
2014-11-01 8:42 ` Eli Zaretskii
2014-11-01 12:56 ` Bruno Félix Rezende Ribeiro
2014-11-01 8:38 ` Eli Zaretskii
2014-11-01 9:16 ` Eli Zaretskii
2014-11-01 12:54 ` Bruno Félix Rezende Ribeiro
2014-11-01 13:03 ` Eli Zaretskii
2014-11-02 21:49 ` Bruno Félix Rezende Ribeiro
2014-11-03 3:34 ` Eli Zaretskii
2014-11-03 6:03 ` Bruno Félix Rezende Ribeiro
2014-11-03 16:20 ` Eli Zaretskii
2014-11-03 17:43 ` martin rudalics
2014-11-03 17:52 ` Eli Zaretskii
2014-11-03 18:01 ` martin rudalics
2014-11-03 18:19 ` Eli Zaretskii
2014-11-03 20:06 ` Bruno Félix Rezende Ribeiro [this message]
2014-11-03 20:24 ` Eli Zaretskii
2014-11-03 20:29 ` Eli Zaretskii
2014-11-03 20:46 ` Eli Zaretskii
2014-11-03 21:01 ` Bruno Félix Rezende Ribeiro
2014-11-03 21:19 ` Eli Zaretskii
2014-11-04 6:05 ` Bruno Félix Rezende Ribeiro
2014-11-04 8:25 ` Bruno Félix Rezende Ribeiro
2014-11-04 16:00 ` Eli Zaretskii
2014-11-04 19:24 ` martin rudalics
2014-11-04 19:52 ` Eli Zaretskii
2014-11-04 20:13 ` Stefan Monnier
2014-11-05 3:39 ` Eli Zaretskii
2014-11-05 9:17 ` Andreas Schwab
2014-11-04 21:09 ` Bruno Félix Rezende Ribeiro
2014-11-05 16:02 ` Eli Zaretskii
2014-11-05 21:38 ` Bruno Félix Rezende Ribeiro
2014-11-06 3:45 ` Eli Zaretskii
2014-11-06 15:28 ` Stefan Monnier
2014-11-04 15:54 ` Stefan Monnier
2014-11-04 21:28 ` Bruno Félix Rezende Ribeiro
2014-11-04 23:11 ` Stefan Monnier
2014-11-04 15:56 ` Eli Zaretskii
2014-11-04 19:24 ` martin rudalics
2014-11-04 20:55 ` Bruno Félix Rezende Ribeiro
2014-11-04 20:14 ` Bruno Félix Rezende Ribeiro
2014-11-05 3:51 ` Eli Zaretskii
2014-11-05 6:28 ` Bruno Félix Rezende Ribeiro
2014-11-05 15:58 ` Eli Zaretskii
2014-11-05 19:46 ` Bruno Félix Rezende Ribeiro
2014-11-03 20:55 ` Bruno Félix Rezende Ribeiro
2014-11-03 20:44 ` Bruno Félix Rezende Ribeiro
2014-11-03 9:08 ` Andreas Schwab
2014-11-03 16:23 ` Eli Zaretskii
2014-11-03 9:41 ` martin rudalics
2014-11-03 18:58 ` Bruno Félix Rezende Ribeiro
2014-11-03 19:14 ` Eli Zaretskii
2014-11-03 20:10 ` Bruno Félix Rezende Ribeiro
2014-11-04 7:55 ` martin rudalics
2014-11-04 8:20 ` Bruno Félix Rezende Ribeiro
2014-11-04 9:19 ` martin rudalics
2014-11-04 10:25 ` Bruno Félix Rezende Ribeiro
2014-11-04 16:16 ` Eli Zaretskii
2014-11-04 19:56 ` Bruno Félix Rezende Ribeiro
2014-11-04 19:23 ` martin rudalics
2014-11-04 21:46 ` Bruno Félix Rezende Ribeiro
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