WebKit Igalia Periodical #6

Shipped the X25519 algorithm of the WebCrypto API for the Mac, GTK+ and WPE ports.

Fixed corner case invoker issue with popover inside invoker, matching the updated spec.

Form controls have long standing interoperability issues and <textarea> is no exception. This patch fixes space being reserved for scrollbars despite overlay scrollbars being enabled. This brings WebKit in line with Firefox's behaviour.

Implemented improvements to the popover API to allow imperative invokers relationships, this brings the JavaScript APIs inline with the declarative popovertarget attribute.

Implemented the CanvasRenderingContext2D letterSpacing/wordSpacing support.

Due to on-going work on improving memory usage in WebRTC use-cases, several patches landed in WebKit (1, 2,3) and GStreamer (4). Another related task is under review in libnice.

Several WebCodecs GStreamer backend fixes landed, mostly related with Opus and LPCM decoding support.

JavaScriptCore now has Wasm tail call support on ARMv7.

OpenType color fonts with SVG outlines stopped working with the transition from Cairo to Skia. This was unintentional, and support for this kind of fonts has been re-enabled for Skia.

Building the OpenType-SVG support required building Skia's SVG module, which uses Expat as its XML parser. Packagers will need to add it as a build dependency, or configure the compilation passing -DUSE_SKIA_OPENTYPE_SVG=OFF, which disables the feature.