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Instead of calling execAction() and then letting it check whether it should actually execute this action, do this check before calling execAction(), to make the code clear and straightforward. Precisely: for multicursor actions, call execAction() in a loop for every cursor, but for non-multicursor actions, call execAction() just once, without a loop. This, in particular, allows to get rid of the hacky "c == nil" check, since we no longer iterate a slice that may change in the meantime (since SpawnMultiCursor and RemoveMultiCursor are non-multicursor actions and thus are no longer executed while iterating the slice).