[Bug 1858791] [NEW] Titlebar corners are not correctly rendered

[Frederik Feichtmeier]

Public bug reported:

With 18.04 and inside the regular Xorg Ubuntu session (and the Ambiance theme selected) the corners of the headerbar/titlebar in firefox 71.0 are not correctly rendered.
There is a white area "bleeding" out of the rounded border making the window a square.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "firefox_corner_bug.png"
   https://bugs.launchpad.net/bugs/1858791/+attachment/5318555/+files/firefox_corner_bug.png

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Title:
  Titlebar corners are not correctly rendered

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