My env: archlinux + xfce4 when using gvim + dejavu mono sans 10.5 (the perfect font) some '_' cannot seen. But when you let the cursor at the '_' . It showed again...Strange.
Only in gvim. In xfce and terminator is OK!!!!
I'm hit by this bug in urxvt URxvt.font: xft:monospace:pixelsize=14
http://savannah.nongnu.org/bugs/?37182
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