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Undo is now able to return deleted nodes back to the graph. However, they seem to lose their position.
Funny that the import comes back to the right place.
TEMP: Change metadata on removeNode/Edge/Group
Journal was not getting enough information to recreate the position
of nodes, which is stored in the metadata.
Graph: Emit metadata changes on node/edge/ports removal
Needed for the journal to be able to restore metadata when undoing removals.
Fixes noflo/noflo-ui#96, undoing node removal resets position to 0,0
Pullrequest with fix: noflo/noflo#148
I noted this as a know issue in the undo-redo pullrequest ;)