What's new in the WebKitGTK 2.49.3 release?
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  - Add new API to get the theme color of a WebKitWebView.
  - Fix rendering with GTK 3.
  - Notify automation session on abnormal disconnections.
  - Fix a crash by ensuring SkiaRecordingResult is destroyed on the main thread.
  - Fix build on s390x.
  - Fix the build with GTK 3.
  - Fix several crashes and rendering issues.