What's new in the WebKitGTK 2.50.6 release?
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  - Fix sample code included in the documentation of the
    webkit_user_content_manager_register_script_message_handler()
    function.
  - Fix MP4 muxing when using GStreamer 1.28.
  - Fix WebAudio not resuming correctly after using window.alert()
  - Fix WebAudio producing incorrect output in some cases due to
    incorrect sample buffer management.
  - Fix several crashes and rendering issues.