Fix fluxbox wallpaper (and change it to be a checkerboard)

utils/gui-wrapper.sh

@@ -7,17 +7,23 @@ shift           # the following arguments are the program to execute and its arg
 
 bg="$(mktemp --suffix='.png')"
 fb_cfg="$(mktemp --suffix='fluxbox.cfg')"
+fb_sty="$(mktemp --suffix='fluxbox.style')"
 
 # Create solid black background
-convert -size 16x16 xc:black "$bg"
+convert -size "$(echo "$resolution" | cut -d 'x' -f1-2)" tile:pattern:checkerboard "$bg"
 
 # Create minimalist fluxbox configuration
-cat > "$fb_cfg" <<EOF
+cat > "$fb_sty" <<EOF
 background:	fullscreen
 background.pixmap:	$bg
 EOF
 
+cat > "$fb_cfg" <<EOF
+session.styleFile: $fb_sty
+EOF
+
+
 xvfb-run -a --server-args="-screen 0 ${resolution}" sh -c 'fluxbox -rc '"$fb_cfg"' 2>/dev/null & sleep 3; "$@"' utils/gui-wrapper.sh-subshell "$@"
 
 # Cleanup
-rm "$bg" "$fb_cfg"
+rm "$bg" "$fb_cfg"