xwidgets: re-enable with newer webkit2gtk

By disabling hw-acceleration we can re-enable xwidgets with newer
webkit2gtk versions (Bug#80728).
Newer versions were disallowed (Bug#66068) since they abort when a
webkit view is created; however, they work fine as long as we disable
hw-acceleration, since the off-screen windows that xwidgets uses do not
support that.
* configure.ac: Remove upper-bound for webkit2gtk version check.
* src/xwidget.c (Fmake_xwidget): Turn off hardware-acceleration.

Copyright-paperwork-exempt: yes

1 files changed, 9 insertions, 0 deletions

diff --git a/src/xwidget.c b/src/xwidget.c
index 0efb3466c34..503b554696d 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -380,6 +380,15 @@ fails.  */)
           g_object_set (G_OBJECT (settings), "enable-developer-extras", TRUE, NULL);
           g_object_set (G_OBJECT (settings), "enable-javascript",
                         (gboolean) (!xwidget_webkit_disable_javascript), NULL);
+#if WEBKIT_CHECK_VERSION (2, 16, 0)
+          /* the webkit view is created on an *offscreen* window, on
+             which hardware acceleration is not supported; we need to
+             tell webkitgtk _not_ to try that, since it will fail & abort()
+             with recent versions. */
+
+          webkit_settings_set_hardware_acceleration_policy
+            (settings, WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER);
+#endif
         }
 
       gtk_widget_set_size_request (GTK_WIDGET (xw->widget_osr), xw->width,