Created attachment 386809 [details] test case [HarfBuzz] Arabic diacritics makes lines unaligned vertically This is the issue #2 in the following mail reported by Farhad Mohammadi Majd. [webkit-gtk] WebKitGTK has 4 problems with Arabic script https://lists.webkit.org/pipermail/webkit-gtk/2019-December/003566.html
Created attachment 386810 [details] [screenshot] GTK port
This issue seems with Bug 118221.
Fixed in r254190. Closed. screenshots of before and after: https://ibb.co/album/ioAUgF *** This bug has been marked as a duplicate of bug 118221 ***