move: damage all the border area in outline mode and ignore transparent colors
Also we don't really need to damage at every X event. It's just about doing it right the firs time, by including the exceeding space. Also optimize damanging in outline-mode, by only touching such regions Plus add some optimizations when not blending, as we don't care about the alpha channel (LP: #1700859) Approved by: Andrea Azzarone
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