Merge branch 'master' of git://repo.or.cz/git-gui

Merge branch 'master' of git://repo.or.cz/git-gui

* 'master' of git://repo.or.cz/git-gui:
  git-gui: Correct 'git gui blame' in a subdirectory
  git-gui: Do not offer to stage three-way diff hunks into the index
  git-gui: Refactor diff pane popup support for future improvements
  git-gui: Fix "unoptimized loading" to not cause git-gui to crash
  git-gui: Paper bag fix "Stage Hunk For Commit" in diff context menu
  git-gui: Allow git-merge to use branch names in conflict markers
  git-gui: Fix window manager problems on ion3