[BZ#159552] VC operations shouldn't be blocking

Submitted by Thorsten Roggendorf

Assigned to Stephen Kennedy

Link to original bug (#159552)

Description

It would be helpful if a svn (probably concerns cvs too) commit did not block the rest of the interface. When some time went by between commits, I usually browse the diffs while writing the commit log. Since meld stores the log entries even if the commit is canceled, one can use meld that way, but having the rest of the gui available while writing the commit would be more convenient.