Open Bug 1272174 Opened 9 years ago Updated 2 years ago

Lots of repainting and checkerboarding on https://mobile.twitter.com/home

Categories

(Core :: Layout, defect)

Product:
Core
Component:
Layout
Type:
defect

Tracking

()

Tracking Flags:
Tracking Status
platform-rel --- +
firefox49 --- affected

People

(Reporter: mstange, Unassigned)

References

(Blocks 1 open bug)

Details

(Whiteboard: [platform-rel-Twitter])

STR: 1. Go to https://mobile.twitter.com/home and log in. 2. Scroll down a few pages. 3. Enable paint flashing. 4. Slowly scroll up and down. The whole page flashes.
They use a virtual list implementation that fills up the space on the top and bottom using padding-top and padding-bottom on the wrapper element. nsStylePadding::CalcDifference returns NS_STYLE_HINT_REFLOW which includes NS_STYLE_HINT_VISUAL which includes nsChangeHint_RepaintFrame. I've experimentally changed NS_STYLE_HINT_REFLOW to nsChangeHint(nsChangeHint_SchedulePaint | nsChangeHint_AllReflowHints) but we're still repainting everything during scrolling.
Whiteboard: [platform-rel-Twitter]
platform-rel: --- → ?
platform-rel: ? → +
Rank: 8
Severity: normal → S3
You need to log in before you can comment on or make changes to this bug.