Comment 17 for bug 1639372

Yes agreed, this fix looks ok, and this is already being carried by Debian Sid. Carrying this in the devel tree seems like the next logical step, and if no issues arise from the extra testing and review, it looks suitable for landing in 1.14 stable too.

Landed:
To ssh://git.freedesktop.org/git/cairo
   35fccff..38fbe62 master -> master

Given the feedback in comments 7 & 8 I'm going to leave this report open for now as reminder to investigate further, although it might be worthwhile to break those out as a separate bug report or two so this one can be closed.