Merge https://github.com/prati0100/git-gui

* https://github.com/prati0100/git-gui:
  git-gui: Handle Ctrl + BS/Del in the commit msg
  Subject: git-gui: fix syntax error because of missing semicolon

diff --cc git-gui/git-gui.sh
Simple merge

diff --cc git-gui/lib/index.tcl
Simple merge

diff --cc git-gui/lib/mergetool.tcl
Simple merge