[Webkit-unassigned] [Bug 196608] Update touch-action region on property changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196608

--- Comment #5 from Antti Koivisto <koivisto at iki.fi> ---
> It's a shame to trigger expensive event region building for non-layout
> changes like color changes. Can we use a StyleDiff somewhere instead?
> Imagine an animation of background-color triggering region rebuilds every
> frame :(

We could certainly implement finer grained invalidation. Not sure yet if it is worth additional complexity, in most cases (at least when touch-action is not involved) region building should be very cheap due to ability to bail out early in the common case. We'll see if it actually shows up in profiles.

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