823b67b1e6
They Typography extension automatically converts two hyphens `--` into an em dash `–`, which means typing three hyphens in a row results in an em dash and a hyphen `–-`, instead of triggering an hr. I propose adding the `–-` pattern to this `nodeInputRule` so typing three hyphens in a row will still trigger an hr, even if 'smart dashes' are enabled via the Typography extension or otherwise.