Only check overlay extensions on git-tracked files
Only check overlay extensions on git-tracked files

This way, when editors leave over temporary files from editing
user-overlays, we don't prevent commits unless they are added to git.

maximedenes/coq,ppedrot/coq,silene/coq,gares/coq,Zimmi48/coq,maximedenes/coq,maximedenes/coq,ejgallego/coq,ejgallego/coq,JasonGross/coq,JasonGross/coq,gares/coq,SkySkimmer/coq,maximedenes/coq,ppedrot/coq,ejgallego/coq,ejgallego/coq,ppedrot/coq,Zimmi48/coq,coq/coq,silene/coq,JasonGross/coq,coq/coq,coq/coq,maximedenes/coq,JasonGross/coq,ppedrot/coq,Matafou/coq,Zimmi48/coq,SkySkimmer/coq,gares/coq,Matafou/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,SkySkimmer/coq,Matafou/coq,silene/coq,coq/coq,ppedrot/coq,gares/coq