Merge branch 'za/completion-hide-dotfiles' into jch

The path completion for commands like `git rm` and `git mv`, is being
updated to hide dotfiles by default, unless the user explicitly starts
the path with a dot, matching standard shell-completion behavior.

* za/completion-hide-dotfiles:
  completion: hide dotfiles by default for path completion
  completion: hide dotfiles for selected path completion

diff --cc contrib/completion/git-completion.bash
Simple merge

diff --cc t/t9902-completion.sh
Simple merge