Wrong match of fonts:
fc-match "Courier 10 Pitch"
DejaVuSans.ttf: "DejaVu Sans" "Book"
The font which provides Courier is not proportional. This was fixed by installation of xorg-x11-fonts-Type1.noarch
"10 Pitch" is not a standard font style name, so you're not requesting the "Courier" font in 10 size but the "Courier 10 Pitch" font in any size, which is not a font name popular enough to be worth aliasin IMHO
Try fc-match "Courier" instead
I found this problem in ooimpress which match fonts incorrectly. It matches Courier from wrong (non-proportional) font package. I still believe this mapping should be fixed in this application.
It's actually a bug in openoffice.org: not all font attributes are transferred through DrawingLayer, so font match will find wrong font later.
Created attachment 361046 [details]
The first line uses "Courier 10 Pitch", the second one "DejaVu Sans" and the third "DejaVu Sans Mono". If the font package specified in description is not installed, the font of the first line is (incorrectly) matched to "DejaVu Sans" instead of "DejaVu Sans Mono" as it should be.
Fix checked in, will be in >= 3.1.1-19.8 .