Do not synchronously measure SVG text every time it changes

[Ahmad Saleem]

Hi team,

While going through Blink's commit, I came across another potential optimization but I haven't confirmed whether it is something applicable in WebKit realm or not.

Blink Commit: https://chromium.googlesource.com/chromium/src.git/+/34c351416a102e4ee510badb86fbc4f57604ccd0

WebKit Source: https://searchfox.org/wubkat/rev/3e2262b3476ecfb5666a35bcdd746d474c061b0d/Source/WebCore/rendering/svg/RenderSVGText.cpp#286

Just wanted to raise to get an input from others.

____

It compiles:

// The positioning elements cache depends on the size of each text renderer in the
    // subtree. If this changes, clear the cache and mark it for rebuilding in the next layout.
    m_layoutAttributesBuilder.clearTextPositioningElements();
    setNeedsPositioningValuesUpdate();
    setNeedsLayout();

_____

Thanks!

[Vitor Roriz]

Cool. I can check if break anything and/or have a significant performance boost with that change. Thank you!

[Radar WebKit Bug Importer]

<rdar://problem/118451741>

[Vitor Roriz]

Pull request: https://github.com/WebKit/WebKit/pull/21278

[EWS]

Committed 271678@main (97f84b2e6bd1): <https://commits.webkit.org/271678@main>

Reviewed commits have been landed. Closing PR #21278 and removing active labels.