345062 - No painting while key-scrolling with spellchecker on

Status: VERIFIED FIXED

(Core :: Spelling checker, defect)

Description

[Boris Zbarsky [:bzbarsky]]

BUILD: Current trunk build

STEPS TO REPRODUCE:
1)  Load http://en.wikipedia.org/w/index.php?title=Jimi_Hendrix&action=edit
2)  Scroll all the way to the bottom of the textarea (in an attempt to avoid
    bug 345048).
3)  Click in the textarea.
4)  Hold down the up arrow key.
5)  Wait until the caret hits the top of the textarea, and continue holding the
    up arrow.

EXPECTED RESULTS: Textarea starts scrolling up, repainting as it goes.

ACTUAL RESULTS:  No display change until you release the up arrow key; then after some 100% CPU time the textarea jumps up to a new locations.

NOTES:  Turning off spell-checking for the textarea leads to the expected results happening.  On a much faster machine than mine, I manage to scroll up about 10-15 lines before the lagging sets in.  This is also reproducible on the 1.8 branch.  You get the same result with pageup/pagedown; it's just easier to go for a long time with up-arrow.

Comment 1

[Brett Wilson]

This was fixed by bug 344560, at least for me.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Yeah, this is a lot better.  It still kinda sucks to use, but that seems to be cairo's fault.