1502059 - Receiving a relative scroll offset update can cause momentum scrolling to stop

Status: RESOLVED FIXED

(Core :: Panning and Zooming, enhancement, P3)

Description

[Ryan Hunt [:rhunt]]

See bug 1453425 comment 20.

Previously when APZ received a scroll offset update it would clobber its own offset and cancel any scroll animation like momentum scrolling. [1]

Now when we're receiving a relative offset update we should do better and try and preserve any scroll animation.

[1] https://searchfox.org/mozilla-central/rev/72b1e834f384a2ffec6eb4ce405fbd4b5e881109/gfx/layers/apz/src/AsyncPanZoomController.cpp#4390

Comment 1

[Ryan Hunt [:rhunt]]

Attachment: Bug 1502059 - Don't always cancel a scroll animation when we have a relative scroll offset update. r?botond

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/b04f3425ee03
Don't always cancel a scroll animation when we have a relative scroll offset update. r=botond

Comment 3

[Eliza Balazs [:ebalazs_]]

https://hg.mozilla.org/mozilla-central/rev/b04f3425ee03