What's new in the WebKitGTK 2.49.4 release?
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  - Enable CSS property font-variant-emoji is now enabled by default.
  - Improve emoji font selection.
  - Add SVT-AV1 encoder support to media backend.
  - Show device scale factor in webkit://gpu.
  - Fix font rendering of composed characters with certain fonts.
  - Fix handling of font synthesis properties (bold/italic).
  - Fix documentation of WebKitDeviceInfoPermissionRequest.
  - Fix several crashes and rendering issues.