switching on OT-SVG support in QT WebEngine

[Hin-Tak Leung]

Hi - everybody who uses QT WebEngine,

I submitted the patches for switching on OT-SVG support in QT WebEngine, and the developer would like some use cases etc. So here is the chance to have your view heard.

https://bugreports.qt.io/browse/QTBUG-120543

Background:

QT4 used webkit, but QT5 and QT6 switched to a slimmed down chromium derivative code based called WebEngine. So they lost the decade-long OT-SVG support from webkit (and firefox). Google folks have been pushing their own "rich color format" COLRv1 for a while, and wouldn't implement it in chrome. Until mid-2021, they added it, but left it disabled. It is a one-liner addition to switch it on, plus other small additions in the area of "not ignoring/dropping unknown font formats" elsewhere.