gtk: Don't warp absolute pointer

This matches the behavior of SDL, and makes the mouse usable when
using -display gtk -vga qxl

https://bugzilla.redhat.com/show_bug.cgi?id=1051724Signed-off-by: NCole Robinson <crobinso@redhat.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/gtk.c

@@ -340,6 +340,10 @@ static void gd_mouse_set(DisplayChangeListener *dcl,
     GdkDeviceManager *mgr;
     gint x_root, y_root;
 
+    if (qemu_input_is_absolute()) {
+        return;
+    }
+
     dpy = gtk_widget_get_display(s->drawing_area);
     mgr = gdk_display_get_device_manager(dpy);
     gdk_window_get_root_coords(gtk_widget_get_window(s->drawing_area),
@@ -355,6 +359,10 @@ static void gd_mouse_set(DisplayChangeListener *dcl,
     GtkDisplayState *s = container_of(dcl, GtkDisplayState, dcl);
     gint x_root, y_root;
 
+    if (qemu_input_is_absolute()) {
+        return;
+    }
+
     gdk_window_get_root_coords(gtk_widget_get_window(s->drawing_area),
                                x, y, &x_root, &y_root);
     gdk_display_warp_pointer(gtk_widget_get_display(s->drawing_area),