I suppose the followings are typo.

1) Tooltip of 'Use shortcut to focus visible window' in Drop-down preference
"If enabled, the shortcut to open en retract the window will give focus, <snip>"

s/open en retract/open and retract/ (?)

2) man page > paragraph of --drop-down option
"<snip> It is adviced to bind this to a shortcut in the keyboard preferences."

s/adviced/advised/

version:
git master