Clear xwidget passive grab whenever a drag begins

* src/xwidget.c (xv_drag_begin_cb): New function.
(xwidget_view_from_window): Attach said function to grab widget
when a grab starts.
* src/xwidget.h (struct xwidget_view): New field
`passive_grab_drag_signal'.

2 files changed, 26 insertions, 0 deletions

diff --git a/src/xwidget.c b/src/xwidget.c
index c5f4c0ee944..2080f109cdd 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -1139,6 +1139,23 @@ run_file_chooser_cb (WebKitWebView *webview,
 #ifdef HAVE_X_WINDOWS
 
 static void
+xv_drag_begin_cb (GtkWidget *widget,
+                  GdkDragContext *context,
+                  gpointer user_data)
+{
+  struct xwidget_view *view = user_data;
+
+  if (view->passive_grab)
+    {
+      g_signal_handler_disconnect (view->passive_grab,
+                                   view->passive_grab_destruction_signal);
+      g_signal_handler_disconnect (view->passive_grab,
+                                   view->passive_grab_drag_signal);
+      view->passive_grab = NULL;
+    }
+}
+
+static void
 xwidget_button_1 (struct xwidget_view *view,
                   bool down_p, int x, int y, int button,
                   int modifier_state, Time time)
@@ -1170,6 +1187,10 @@ xwidget_button_1 (struct xwidget_view *view,
         = g_signal_connect (G_OBJECT (view->passive_grab),
                             "destroy", G_CALLBACK (gtk_widget_destroyed),
                             &view->passive_grab);
+      view->passive_grab_drag_signal
+        = g_signal_connect (G_OBJECT (view->passive_grab),
+                            "drag-begin", G_CALLBACK (xv_drag_begin_cb),
+                            view);
     }
   else
     {
@@ -1230,6 +1251,8 @@ xwidget_button_1 (struct xwidget_view *view,
         {
           g_signal_handler_disconnect (view->passive_grab,
                                        view->passive_grab_destruction_signal);
+          g_signal_handler_disconnect (view->passive_grab,
+                                       view->passive_grab_drag_signal);
           view->passive_grab = NULL;
         }
     }
@@ -3205,6 +3228,8 @@ DEFUN ("delete-xwidget-view",
     {
       g_signal_handler_disconnect (xv->passive_grab,
                                    xv->passive_grab_destruction_signal);
+      g_signal_handler_disconnect (xv->passive_grab,
+                                   xv->passive_grab_drag_signal);
       xv->passive_grab = NULL;
     }
 
diff --git a/src/xwidget.h b/src/xwidget.h
index 79dee37695d..8b47a0b9046 100644
--- a/src/xwidget.h
+++ b/src/xwidget.h
@@ -122,6 +122,7 @@ struct xwidget_view
   GdkWindow *last_crossing_window;
   GtkWidget *passive_grab;
   guint passive_grab_destruction_signal;
+  guint passive_grab_drag_signal;
 #else
   struct pgtk_display_info *dpyinfo;
   GtkWidget *widget;