From Matevz: Prevent multiple addition of extra-tabs in ActivateEditor().
From Matevz:
Prevent multiple addition of extra-tabs in ActivateEditor().


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@19713 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root