1049277 - ScrollbarActivity animates fade effect for documents in BF cache

Status: NEW

(Core :: Layout, defect)

Description

[Ben Kelly [:bkelly, not reviewing]]

While investigating bug 995688 we found that ScrollbarActivity is continuing to animate the scrollbar fade effect for documents that have been frozen and places in the BF cache.

It seems that ScrollbarActivity should observe the DOM_WINDOW_FROZEN_TOPIC in order to stop animating while frozen.

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

Or Presshell/Prescontext should just tell it to unregister itself from refreshdriver, or
hmm... why does refreshdriver even tick here.
Though, it is possible, in theory at least, to move a document to bfcache during a tick.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

But still, why do we even see a tick here.

Comment 3

[Ben Kelly [:bkelly, not reviewing]]

I saw multiple opacity changes when I had instrumentation added.  So it seems like many ticks are seen.