[Webkit-unassigned] [Bug 199152] [iOS] Scrolling on an enlarged Facebook video gets locked on the main frame

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199152

--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 372758
  --> https://bugs.webkit.org/attachment.cgi?id=372758
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=372758&action=review

> Source/WebKit/ChangeLog:11
> +        Scrollable content on the page consists is in overflow scrollers, the main frame is not scrollable. However we still enable
> +        vertical rubberbanding in the main frame.
> +

Is the main frame not overflow:hidden in this case (which should disable scrolling)?

> Source/WebKit/ChangeLog:14
> +        other scrollers don't receive swipes, further attempts just keep the main view in in rubberbanding state. This
> +        makes scrolling feel glitchy (rubberbanding is only observable in the scrollbar since no content moves).

This is really a UIKit bug (44777596).

> Source/WebKit/ChangeLog:17
> +        This patch disables rubberbanding in non-scrollable main frame if it contains a scrollable element that covers at least
> +        50% of the view.

That seems pretty likely to break legitimate cases. Also, you don't seem to be only disabling bouncing when the main frame is not scrollable.

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