Comment 47 for bug 1536751

I can now see part of the problem more clearly.

If you look at labels that contain the same letter multiple times like "Calculator" or "Security & Privacy", then it becomes apparent that the clarity of that same letter changes depending on where it is in the word.

Given that Qt caches individual glyphs (discovered in bug 1583088), this variation in clarity should never happen. Most likely the problem is Qt's text rendering is failing to place some glyphs at integer x locations, which is a big deal on regular low DPI displays.