GitUI.CommandsDialogs.FormBrowse.getNextPatchFile C# (CSharp) Method

        private Tuple<int, string> getNextPatchFile(bool searchBackward)
        {
            var revisions = RevisionGrid.GetSelectedRevisions();
            if (revisions.Count == 0)
                return null;
            int idx = DiffFiles.SelectedIndex;
            if (idx == -1)
                return new Tuple<int, string>(idx, null);

            idx = getNextIdx(idx, DiffFiles.GitItemStatuses.Count() - 1, searchBackward);
            _dontUpdateOnIndexChange = true;
            DiffFiles.SelectedIndex = idx;
            _dontUpdateOnIndexChange = false;
            return new Tuple<int, string>(idx, DiffText.GetSelectedPatch(RevisionGrid, DiffFiles.SelectedItem));
        }