[Shotwell] 0.12.1+TRUNK

[Dougie Nisbet]

another feature seems to be a Multi-select Enhance. I discovered this 
when I selected about 50 photos to export, and hit Ctrl-E, which doesn't 
export, it enhances.

I think this could be a problem if there's no Undo-Enhance feature. I 
didn't get as far as finding out because the performance degradation 
issues mention in my OP kicked in and the Enhance hung on 27% and 
wouldn't accept a Cancel.