Consistently use SVGLayerTransformComputation whenever transformations need to be computed in the SVG render tree, utilizing 'TransformState' and 'mapLocalToContainer', which were previously extended for SVGs needs (TransformState::TransformMatrixTracking). This assures that the very same transformation matrices / code paths are used independent if one is using getBoundingClientRect() / getCTM() / getBBox() or when computing repaint rects, layer transform matrices - etc.
Pull request: https://github.com/WebKit/WebKit/pull/6297
<rdar://problem/102412168>
Committed 256862@main (5c3443a0ab7a): <https://commits.webkit.org/256862@main> Reviewed commits have been landed. Closing PR #6297 and removing active labels.