Refactoring: RenameVariable: Support interaction with auto-completion.  When an a-c suggestion is selected, continue the multiple selections, if they were up before.

(integrated from komodo (trunk) change 79400 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13474 b87d16e7-d29f-4ee1-b5ec-817d645d335f