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bug#27647: 26.0.50; Line numbers implemented natively disappear momentar
From: |
Noam Postavsky |
Subject: |
bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus |
Date: |
Thu, 09 Nov 2017 19:38:30 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) |
Kaushal Modi <kaushal.modi@gmail.com> writes:
> Thanks for spending time to debug this and come up with that crucial
> fix. Did any of the within-emacs debug tactics help you figure this
> out? Or was it putting breakpoints and catching them in gdb? Or did
> you go the final hard way, and review the code manually?
So glad you asked, now I can relive the glory of the hunt :D
The first thing I tried was the 'watch Vdisplay_line_numbers', but this
gave me no hits except for some spurious stuff related to buffer-local
variables; after changing to (setq-default display-line-numbers t) I got
no hits at all. So it was fairly clear that the problem lay below the
lisp level.
Then I considered putting a breakpoint into the display code, which is a
bit tricky because I needed to drag the mouse to trigger the problem,
but if a breakpoint is hit before that Emacs is frozen and can't
register the mouse drag. I tried to reduce the recipe to some lisp code
to be evaluated based on mouse-drag-and-drop-region, but I didn't
manage to come up with something that worked.
Then I looked a bit through the display code to figure if a breakpoint
conditioned on mouse dragging could work, and I noticed the
should_produce_line_number function, so I just put a breakpoint on every
place which returned false. Bang, success!
Except I then had to check the values of WINDOW_FRAME (it->w) to make
sure I hadn't actually hit the case where the code *correctly* skips
line numbers for tooltips. A quick grep for tip_frame soon turned up
x_hide_tooltip which had the comment that explained what was going on.
> Also thanks to everyone who helped figure out a recipe, which is
> equally important :).
Most definitely, I could not have done anything without a simple way to
reproduce the problem.
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, (continued)
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/13
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, martin rudalics, 2017/11/14
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/14
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, martin rudalics, 2017/11/14
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/14
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, martin rudalics, 2017/11/15
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, martin rudalics, 2017/11/15
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/18
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, martin rudalics, 2017/11/18
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Kaushal Modi, 2017/11/09
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus,
Noam Postavsky <=
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/09
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Romanos Skiadas, 2017/11/09
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/09
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Noam Postavsky, 2017/11/09
- bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus, Eli Zaretskii, 2017/11/10