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Patch from Mark Wooding: use gdk_event_request_motions() where
available, which magically seems to eliminate most if not all of the
update lag when dragging a point in a large (say 250-point)
Untangle. I don't fully understand how this works, but it seems to!

[originally from svn r8600]

--- a/gtk.c

+++ b/gtk.c

@@ -646,6 +646,11 @@

     if (!midend_process_key(fe->me, event->x - fe->ox,

                             event->y - fe->oy, button))

 	gtk_widget_destroy(fe->window);

+#if GTK_CHECK_VERSION(2,12,0)

+    gdk_event_request_motions(event);

+#else

+    gdk_window_get_pointer(widget->window, NULL, NULL, NULL);

+#endif

     return TRUE;

 }

@@ -1898,7 +1903,8 @@

     gtk_widget_add_events(GTK_WIDGET(fe->area),

                           GDK_BUTTON_PRESS_MASK |

                           GDK_BUTTON_RELEASE_MASK |

-			  GDK_BUTTON_MOTION_MASK);

+			  GDK_BUTTON_MOTION_MASK |

+			  GDK_POINTER_MOTION_HINT_MASK);

     if (n_xpm_icons) {

 	gtk_widget_realize(fe->window);