message: Disable filemode hunk for untracked files
  the header of untracked files remains empty. The initial filemode change '0 -> *' is not shown.
diff: @@ -756,7 +756,7 @@ public:
  });
  // Show file mode diff
  - if (filemode || header.isEmpty()) {
  + if (filemode) {
  mOldMode = diff.old_mode(index);
  mNewMode = diff.new_mode(index);
  @@ -766,7 +766,6 @@ public:
  mLabel->setText(kHunkFmt.arg(escaped));
  // Hide buttons
  - if (filemode) {
  edit->setVisible(false);
  if (discard)
  discard->setVisible(false);
  @@ -774,7 +773,6 @@ public:
  }
  }
  }
  - }
  QCheckBox *check() const { return mCheck; }
  