ervandew/supertab — pull request #135 by nowox (2014-10-14 22:22:42+00:00)
Title: Not map <c-x> if already mapped to something else

I am using as cut like every other editor. In insertion mode, this mapping will cut the word under cursor. Unfortunately your plugin will automatically remap to execute ManualCompletionEnter(). I added some code to avoid this mapping is is already user mapped. I also added a g:SuperTabMappingTabManual to let the user choose its own mapping.