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Dmitry Kazakov authored
1) The KisBaseRectsWalker now saves notifications for the clones. It does this by calculating uncropped changeRect of the source layer and storing the node/rect pairs in a special array. 2) KisAsyncMerger takes the contents of this array and notifies the clones after the source layer's update is finished 3) If clone needs an area of the source layer that was not generated during normal update (it is placed outside the image), it calculates its contents in KisUpdateOriginalVisitor by recursively calling to KisRefreshSubtreeWalker/KisAsyncMerger.
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