What's new in the WebKitGTK 2.54.2 release?
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  - Fix performance when compositing layers with backdrop filters.
  - Fix prewarmed web process leak when they are rejected due to sandboxing.
  - Release suspended pages and idle processes on memory pressure.
  - Bind /dev/dxg in the bubblewrap sandbox.
  - Notify input method about cursor area or surrounding text after a re-focus.
  - Clear input method composition underlines before adding new ones.
  - Do not enable input method for read-only text fields.
  - Update the input method state when readonly changes on the focused element.
  - Add User-Agent quirk for OrangeTV.
  - Fix several crashes and rendering issues.