[Webkit-unassigned] [Bug 223021] CSS scroll snap should allow scrolling to the middle of snap areas that overflow the snapport

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223021

Martin Robinson <mrobinson at webkit.org> changed:

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--- Comment #2 from Martin Robinson <mrobinson at webkit.org> ---
Created attachment 423466

  --> https://bugs.webkit.org/attachment.cgi?id=423466&action=review

Patch

Here's some background on these changes as they are a bit larger and more complicated than normal:

Before this change when snap points were calculated after a layout and a ScrollSnapOffsetsInfo was created with both the offsets of the snap points and a set of ranges of offsets where no snapping occurred. These ranges were useful because it made it simple to determine if a particular offset was subject to snapping. With the implementation of this part of the specification, the range-based approach is not as suitable because snap areas (which may overlap) now affect whether or not a scroll will snap to a snap point.

Instead, this change take a lazier approach. During scrolling, we walk through each potential snap offset and look at the associated snap area. This information to determine if the destination scroll offset falls onto a snap area that overflows the snapport or if it is subject to proximity snapping.

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