Merge branch 'maint'

Merge branch 'maint'

* maint:
  Document ls-files --with-tree=<tree-ish>
  git-commit: partial commit of paths only removed from the index
  git-commit: Allow partial commit of file removal.
  send-email: make message-id generation a bit more robust
  git-gui: Disable native platform text selection in "lists"
  git-gui: Paper bag fix "Commit->Revert" format arguments
  git-gui: Provide 'uninstall' Makefile target to undo an installation
  git-gui: Font chooser to handle a large number of font families
  git-gui: Make backporting changes from i18n version easier
  git-gui: Don't delete send on Windows as it doesn't exist
  git-gui: Trim trailing slashes from untracked submodule names
  git-gui: Assume untracked directories are Git submodules
  git-gui: handle "deleted symlink" diff marker
  git-gui: show unstaged symlinks in diff viewer
  git-gui: Avoid use of libdir in Makefile
  git-gui: Disable Tk send in all git-gui sessions
  git-gui: lib/index.tcl: handle files with % in the filename properly
  git-gui: Properly set the state of "Stage/Unstage Hunk" action
  git-gui: Fix detaching current branch during checkout
  git-gui: Correct starting of git-remote to handle -w option