usability bug: git-gui: keyboard shortcuts don't operate correctly on multi-file selections

Ctrl+T/Ctrl+U add/remove only one file, not the whole selection - used
to work. Neither are access keys for menu underlined (Ease of access
center > underline keyboard shortcuts is on), so there is no way to
effectively work with keyb only. 

git-gui verison 0.21 GITGUI 
git version 2.11.1.windows.1
Tcl/Tk 8.6.6
64-bit installer
Windows 7 Professional

Originally posted at
https://github.com/git/git-scm.com/issues/939#issuecomment-276024341


peter.fargas @
informatik-handwerk.de
0176 / 458 67 358