Feature for danvk/webdiff/issues/102 Show file name page title.
Feature for danvk/webdiff/issues/102 Show file name page title.

Shows the file name and diff type the same way as the dropdown menu does when
you have several diffs.

daytonb/webdiff,danvk/webdiff,daytonb/webdiff,danvk/webdiff,daytonb/webdiff,danvk/webdiff,danvk/webdiff,danvk/webdiff,daytonb/webdiff