Cosmetic issue on left sidebar

The sidebar of the Font view is translucent. If the Glyphs window is positioned on top of a white background, it displays fine (left side of the image below). However, if the window below or the desktop wallpaper is dark, the text gets a white stroke. This only happens on the glyph info part.

<img src="/uploads/default/original/2X/4/49b0aeabc8827d2d6406e9c3e92040e96aae7316.png" width=“342” height=“342"/>

I find similar quirks in many other apps too, that is why I chose to reduce transparency in System Preferences: