On Sun, Aug 09, 2020 at 10:50:23AM +0100, Wasim Abbas wrote:
Yes this is the text from the file I have opened.
I just did a quick test again today and I can reliably reproduce it.
This time however it's not just flipped but corrupt frame buffer as
Here is what I have tried. Open up a longish C++ header file. Scroll
with mouse a few times. Nothing happened. Split the window
vertically and the scrolled a few more time rapidly. The corruption
started in that window only. Visited another buffer in that window
“messages” buffer you can see the flipped text there as well.
Visit the first window (is content was displayed correct so far, I
think because its not refreshed yet) and move cursor up and down 1
line at a time only that line is displayed wrong but also some other
corruptions in random places.
It sounds suspiciously like we're flipping the bitmap and not
unflipping it, but I can't see how that happens.
Are you able to reproduce it with emacs -Q?