SSIA.
Created attachment 63376 [details] datainspector.diff
This patch seems sane to me. Perhaps adding a WEBKITGTK_API_VERSION define and setting it to @WEBKITGTK_API_VERSION@ would make this bit of code future proof though. Then the path could just be: inspectorURI.set(g_filename_to_uri(DATA_DIR"/webkit-"WEBKITGTK_API_VERSION"/webinspector/inspector.html"
Comment on attachment 63376 [details] datainspector.diff Martin is right, we should do as he says. I'll upload a patch doing that tomorrow.
The patch suggested by Martin was committed as r64752, closing.