[webkit-reviews] review requested: [Bug 83720] [Qt][WK2] Nested fixed elements scroll too fast : [Attachment 136766] Patch.

[bugzilla-daemon at webkit.org]

Yael <yael.aharon at nokia.com> has asked	for review:
Bug 83720: [Qt][WK2] Nested fixed elements scroll too fast
https://bugs.webkit.org/show_bug.cgi?id=83720

Attachment 136766: Patch.
https://bugs.webkit.org/attachment.cgi?id=136766&action=review

------- Additional Comments from Yael <yael.aharon at nokia.com>
Before setting the scrollPositionDelta to a fixed layer, check if it has an
ancestor which also has fixed position. If it does, do not set
scrollPositionDelta.
Added a flag to TextureMapperLayer indicating if it is a fixed position layer.
The flag is set in WebLayerTreeRenderer::flushLayerChanges to avoid adding it
also to GraphicsLayerTextureMapper.
If reviewers think it is better to add it to GraphicsLayerTextureMapper, I can
do that.