There is no JSC API provided with WPE 2.20. We don't want to expose the old C API, because that is going to be obsolete in 2.22 and it would be silly to expose at this point. And backporting the new GObject API to this branch would be inappropriate. This means that we need to remove WebKitJavascriptResult from the 2.20 branch, and that takes out WebKitUserContentManager script message handlers. If these APIs are needed, then use the unstable 2.21 release series instead of 2.20.
Created attachment 340105 [details] [WPE][Stable] Remove unusable JavaScript APIs
Created attachment 340112 [details] [WPE][Stable] Remove unusable JavaScript APIs