[Bug 1770047] New: Subpixel rendering failure in Fedora 31 for right-aligned windows on a multihead machine.

https://bugzilla.redhat.com/show_bug.cgi?id=1770047

            Bug ID: 1770047
           Summary: Subpixel rendering failure in Fedora 31 for
                    right-aligned windows on a multihead machine.
           Product: Fedora
           Version: 31
          Hardware: x86_64
                OS: Linux
            Status: NEW
         Component: freetype
          Severity: medium
          Assignee: mkasik(a)redhat.com
          Reporter: alastair(a)d-silva.org
        QA Contact: extras-qa(a)fedoraproject.org
                CC: ajax(a)redhat.com, caillon+fedoraproject(a)gmail.com,
                    fonts-bugs(a)lists.fedoraproject.org,
                    gnome-sig(a)lists.fedoraproject.org,
                    john.j5live(a)gmail.com, kevin(a)tigcc.ticalc.org,
                    mclasen(a)redhat.com, mkasik(a)redhat.com,
                    rhughes(a)redhat.com, rstrode(a)redhat.com,
                    sandmann(a)redhat.com
  Target Milestone: ---
    Classification: Fedora



Description of problem:
I have a 3 monitor setup:
Left: Dell 3007WFP 2560x1600
Middle: Seiki 40" 4K TV 3840x2160
Right: Thinkpad T480 builtin 2048x1152

When a Firefox instance (or Gnome Text Editor window) is right aligned
(meta-right) on the middle screen, it displays properly. However, after
switching virtual consoles (ctrl-alt-up/down/left/right), and returning back,
the right aligned window show subpixel rendering artifacts.

I've attached screenshots before & after switching consoles, the window that
displays the problem is the right browser in the middle screen (visiting
Opencores).

This problem did not occur in Fedora 30, only after upgrading to Fedora 31.

The problem also does not occur if I move the window away from the edge of the
centre display.

Version-Release number of selected component (if applicable):
freetype.x86_64 2.10.0-3.fc31 @fedora

How reproducible:
Every time, with my display configuration

Steps to Reproduce:
1. Launch Gnome Text Editor, ensure it is on the middle screen and enter some
text
2. Right align the window (meta-right)
3. Shift away and back to the virtual console
4. Observe text that was currectly rendered in the text editor now has
artifacts

Actual results:
Poorly rendered text

Expected results:
Correctly rendered text

Additional info:

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