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This patch changes the decorator to always apply stacking-order changes immediately instead of deferring the re-stacking of the nitpicker views to the next call of 'update_nitpicker_views'. The deferred application did not always work when more then one windows changed their stacking position at once because the cached '_neighbor' values interfered with each other. The eager re-stacking should not have negative effects on the user experience because, in contrast to re-positioning, re-stacking a rare operation.