Commit 417f3967 authored by Dmitry Kazakov's avatar Dmitry Kazakov

Fix a crash in the update mechanism

See a comment in KisMergeWalker::startTripWithMask()

parent fc43e93b
......@@ -53,6 +53,22 @@ void KisMergeWalker::startTrip(KisProjectionLeafSP startLeaf)
void KisMergeWalker::startTripWithMask(KisProjectionLeafSP filthyMask)
if (!filthyMask->parent()) {
* Under very rare circumstances it may happen that the update
* queue will contain a job pointing to a node that has
* already been deleted from the image (direclty or by undo
* command). If it happens to a layer then the walker will
* handle it as usual by building a trivial graph pointing to
* nowhere, but when it happens to a mask... not. Because the
* mask is always expected to have a parent layer to process.
* So just handle it here separately.
KisProjectionLeafSP parentLayer = filthyMask->parent();
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