GNOME Bugzilla – Bug 684881
scroll spasms
Last modified: 2012-11-28 21:27:01 UTC
Scrolling isn't very smooth in general for some reason and while testing it I found that we have a strange behavior when I move the pointer horizontally. I'd expect the scrollbar not to move at all but it seems to spasm. The attached screencast is from 3.4 but it is exactly the same in master. I just can't seem to figure out how to enable vp8enc so screencasting works in jhbuild.
Attachment was too large. http://people.gnome.org/~mccann/screenshots/Screencast%20from%2009-26-2012%2010:37:35%20AM.webm
It seems to just be minor pointer variations. Even though it may not look like you're moving the pointer, you probably are, but on values smaller than a pixel, which we'll round off (going from 21.0 to 20.9 and back, which we'll treat as a shift in pixels)
If you look closely you'll actually see the scrollbar handle change size as well. A bit hard to tell in the video but it is clear when you look at the screen. Whatever is causing it it looks and feels bad. We should be moving the view smoothly even if there is one pixel of motion in the handle.
When I try on a low precision mouse I get the same jitter with minimal to no cursor movement.
I also see the handle resize if I move only vertically.
Duping on newer bug that has patches. *** This bug has been marked as a duplicate of bug 689243 ***