https://bugs.documentfoundation.org/show_bug.cgi?id=172399

--- Comment #5 from Patrick (volunteer) <[email protected]> ---
(In reply to John Louis from comment #4)
> I have attached a short screen recording showing:

Thank you for posting the video. I was assuming that you were seeing large
black rectangular areas at the right and bottom edges of the window (i.e. a big
lag in redrawing the window contents at the new size).

But, instead, what I see is that the jitter is caused by window contents being
shifted up and down vertically by a few pixels. What is interesting is that
even when you were resizing the window very slowly, the jittering still
occurred. That's a detail I haven't seen before.

I don't know the cause yet so I have submitted a code change that will skip the
"create a snapshot of the window content from before the window resized,
recreate the window's drawing surface at the new size, and draw the snapshot
onto the new drawing surface" code.

If it passes the automated tests, I'll post steps for testing my code change
tomorrow. My code change may not fix the bug, but if it doesn't fix the bug,
then we'll have eliminated the temporary snapshot as a possible cause of the
bug.

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