Stefan Tröger ca74544959 Don't check for multiple groups when performing a transaction. fixes #0003150 ...

During undo/redo the order in which objects are removed from a group and added to annother is arbitrary, hence it cannot comply to the single Group rule. Not echking for it in this case is unproblematic, as undo/redo only recrete former states, and those states have been checked in normal operation.

2017-09-21 12:48:39 +02:00

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