Assertion when selecting large table in User Guide on master

[Scott Kostyshak]

On Wed, Jul 03, 2024 at 06:35:03PM GMT, Scott Kostyshak wrote:
> On Wed, Jul 03, 2024 at 11:59:14PM GMT, Jean-Marc Lasgouttes wrote:
> > Le 03/07/2024 à 19:34, Scott Kostyshak a écrit :
> > > On Wed, Jul 03, 2024 at 05:48:23PM GMT, Jean-Marc Lasgouttes wrote:
> > > > Le 03/07/2024 à 06:17, Scott Kostyshak a écrit :
> > > > > I still get an assertion while selecting the phone table.
> > > > 
> > > > Hmm, I was two quick in my testing.
> > > > 
> > > > I just pushed two patches which:
> > > > 1/ avoids setting Update::SinglePar in a place where this does not make
> > > > sense
> > > > 2/ make BufferView::singleParUpdate robust in such a case (but still emit a
> > > > warning if the position was not set, which should not happen).
> > > > 
> > > > Please test.
> > > 
> > > Works well! Much harder to break, but 1 out of 30 times I still get an
> > > issue. I don't have a recipe to reproduce. It has to do with scrolling
> > > up fast, and then pausing (by moving the cursor down) then scrolling up
> > > again. I know that's not a useful description. Does the attached
> > > backtrace give a clue?
> > 
> > Well, it looks like the second one we had, fixed by 6e0ea4269a, but it seems
> > that you found a new path to trigger it. The best would be to be able to
> > reproduce it.
> > 
> > Can you open a ticket, please, so that it is not forgotten? I can always fix
> > it with a new test, but I'd rather understand why it happens.
> 
> Sounds good, I'll try to figure out a way to reproduce it somewhat
> reliably, at least on my system. I might experiment with ydotool (like
> xdotool but works additionally with Wayland) to see if that helps to
> reproduce.
> 
> Scott

I made a ticket here and added some more details on a recipe, although
still I can only reproduce it very infrequently:

  https://www.lyx.org/trac/ticket/13081

Scott
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