Code review comment for lp:~inkscape+alexander/inkscape/clones

Ok, so with the small change I did to the codebase, here's what I think should be done:

-> add a "bool skip_undo" flag to ::setMask(), ::unsetMask(), and ::unlink() similar to what's done in other methods in the file. (Also add it to your recursive method).

-> make a ObjectSet with no SPDesktop (just the SPDocument) containing the selection, so that it does not flash recursively.

-> make all the calls with the skip_undo flag on your ObjectSet.