Re: Tabs

[Ergus <spacibba@aol.com>]

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On Wed, Oct 09, 2019 at 05:21:15PM +0300, Eli Zaretskii wrote:
>> Date: Wed, 9 Oct 2019 15:55:39 +0200
>> From: Ergus <spacibba@aol.com>
>> Cc: michael_heerdegen@web.de, juri@linkov.net, emacs-devel@gnu.org
>>
>> >If you set a breakpoint in this fragment from clear_garbaged_frames:
>> >
>> >	  if (FRAME_VISIBLE_P (f) && FRAME_GARBAGED_P (f))
>> >	    {
>> >	      if ((f->resized_p || f->tab_bar_resized)
>> >		  /* It makes no sense to redraw a non-selected TTY
>> >		     frame, since that will actually clear the
>> >		     selected frame, and might leave the selected
>> >		     frame with corrupted display, if it happens not
>> >		     to be marked garbaged.  */
>> >		  && !(f != sf && (FRAME_TERMCAP_P (f) || FRAME_MSDOS_P (f))))
>> >		redraw_frame (f);  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>> >	      else
>> >		clear_current_matrices (f);
>> >
>> >does the breakpoint fire after you type "C-x 6 f"?
>>
>> Yes:
>>
>> Thread 1 "emacs" hit Breakpoint 1, clear_garbaged_frames () at ../../src/xdisp.c:11805
>> 11805                   redraw_frame (f);
>
>So you are saying that the call to redraw_frame does nothing in your
>case?  It's supposed to clear out the entire X window and then cause
>its redisplay...
>
Exactly

>What about disabling double buffering, does it help in any way?
>
The same

>And what about the question I asked earlier about the last master
>build you had that didn't have this problem? do you have an answer?
>
I will look for it now.

>TIA.
>
>Anyway, Juri, I'm at the end of my wits (which evidently are too short
>to begin with) regarding this problem.  It is bad enough to have to
>debug this without being able to reproduce the problem on my machine,
>and in addition, I don't have a clear understanding how this is
>supposed to work.  AFAIU, you just copied the code from the tool-bar
>code, so it's possible that you don't understand that either.  Maybe
>Martin will be able to explain how the tool-bar related flags are
>supposed to work, and maybe that will help me see the light.  But I'm
>not holding my breath, given that even the call to redraw_frame
>doesn't seem to do what it's supposed to.
>
>Do you see the problem described by Jimmy on your system?  If so, are
>you able to debug it on your system (with my help, if you need it)?
>If not, would someone else who sees the problem please try debugging
>it?

This seems to be related with an optimization in redisplay as you said
because sometimes when I get the broken tab-bar if I scroll with the
mouse the bar scrolls too. (attached picture.) This happens with and
without double buffering.

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