1790150 - Make ResizeObserver timing (and refresh driver timing more generally) a bit more explicit.

Status: NEW

(Core :: Layout, task, P3)

Description

[Emilio Cobos Álvarez (:emilio)]

Right now ResizeObserverController runs as a refresh driver Display observer, which means it runs after flushing layout, but ordering is not super clear. It might be worth implementing something a bit more explicit, like e.g., IntersectionObserver does.

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Attachment: WIP: Bug 1790150 - Simpler scheduling of style and layout flushes.

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Olli, wdyt about something along the lines of comment 1?

This is still fairly orange, I need to fix up a couple things that are known broken, but the general idea is there. This should be easier to follow and also match the HTML spec more closely, wdyt?

Comment 3

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

What is the reason to not do explicit style flushes anymore?

Comment 4

[Emilio Cobos Álvarez (:emilio)]

Because style flushes that actually change stuff trigger layout flushes or painting, and layout flushes also flush style.