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drag-action: fix press coords transform with drag_handle
When setting a drag handle, transform the original press coordinates using the drag handle as reference instead of the associated actor. This causes the initial misplacement of drag handle in example/drag-action when holding down the Shift key: the handle gets placed at the main actor origin on the first drag event, instead of following the mouse pointer. All subsequent motion events already use the right actor when transforming the coordinates, thus they are not affected. https://bugzilla.gnome.org/show_bug.cgi?id=681746
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@ -1106,6 +1106,12 @@ clutter_drag_action_set_drag_handle (ClutterDragAction *action,
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priv->drag_handle = handle;
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priv->transformed_press_x = priv->press_x;
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priv->transformed_press_y = priv->press_y;
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clutter_actor_transform_stage_point (handle, priv->press_x, priv->press_y,
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&priv->transformed_press_x,
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&priv->transformed_press_y);
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if (priv->drag_handle != NULL)
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g_signal_connect (priv->drag_handle, "destroy",
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G_CALLBACK (on_drag_handle_destroy),
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