Hover states not updated when overflow section scrolls under stationary mouse pointer

• Component: Layout and Rendering
• Status: RESOLVED FIXED

<rdar://problem/7694674>

When an overflow: scroll; section is scrolled and different elements move under the mosue cursor, hover states don’t update to reflect the change, tool tips don’t update, and mouseover/mouseout events aren’t fired.

I have a patch for this but I haven’t finished the regression test yet.

Created attachment 50563 [details]
Dispatch a fake mouse move event shrotly after scrolling

[WebKit Review Bot]

Attachment 50563 [details] did not build on chromium:
Build output: http://webkit-commit-queue.appspot.com/results/642040

Created attachment 50574 [details]
Dispatch a fake mouse move event shrotly after scrolling

[WebKit Review Bot]

Attachment 50574 [details] did not build on chromium:
Build output: http://webkit-commit-queue.appspot.com/results/643033

Created attachment 50576 [details]
Dispatch a fake mouse move event shrotly after scrolling

[Darin Adler]

Comment on attachment 50576 [details]
Dispatch a fake mouse move event shrotly after scrolling

> +void EventHandler::cancelFakeMouseMoveEvent()
> +{
> +    if (!m_fakeMouseMoveEventTimer.isActive())
> +        return;
> +
> +    m_fakeMouseMoveEventTimer.stop();
> +}

I don't think you need to check isActive before calling stop. It's safe to call it even if the timer is not active.

> +void EventHandler::fakeMouseMoveEventTimerFired(Timer<EventHandler>* timer)
> +{
> +    ASSERT_ARG(timer, timer == &m_fakeMouseMoveEventTimer);

You need to use ASSERT_UNUSED here because "timer" is otherwise unused in this function. I think this is why the Mac EWS build indicates a failure.

I'm a little sad that the test requires a timeout and can't run instantaneously. Could it instead be based on the timing of the first mouse move event?

r=me, but please fix the Mac build issue

Fixed in <http://trac.webkit.org/projects/webkit/changeset/55909>.

[Garret Kelly]

This change broke the Chromium Win Release build: http://build.webkit.org/builders/Chromium%20Win%20Release/builds/3286/steps/compile-webkit/logs/stdio

Build fix in <http://trac.webkit.org/projects/webkit/changeset/55911>.