The input method filter requires the web view to be focused to be enabled. Under X11 we only get the focus if the parent window is a toplevel and tests were using a popup. Using a toplevelo is enough for X11 with a window manager, but not for tests running under xvfb because there isn't a window manager. We need to assume the web view is always focused when running the tests under xvfb
Created attachment 386209 [details] Patch
Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See http://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Created attachment 386210 [details] Patch
Committed r253882: <https://trac.webkit.org/changeset/253882>