Split the chromium switches on different lines.

home/.xsession

@@ -31,7 +31,11 @@ find .config/chromium/ -name "Last *" | xargs rm
 # Start and detach Chromium
 # http://peter.sh/experiments/chromium-command-line-switches/
 # Note that under matchbox, starting in full-screen without a window size doesn't behave well when you try to exit full screen (see https://unix.stackexchange.com/q/273989)
-chromium-browser --start-fullscreen --window-size=1920,1080 --disable-infobars &
+chromium-browser \
+  --start-fullscreen \
+  --window-size=1920,1080 \
+  --disable-infobars \
+  &
 
 # Hide Chromium while it's starting/loading the page
 wid=`xdotool search --sync --onlyvisible --class chromium`