See the discussion in https://github.com/codemirror/CodeMirror/issues/6858
<rdar://problem/87112653>
Created attachment 448337 [details] Patch
<rdar://problem/86910670>
Committed r287593 (245722@main): <https://commits.webkit.org/245722@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 448337 [details].