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About this Add-on
Last version is 1.6!
All buttons have comments -- [comment in] or like F1,F2.
But here is some else hotkeys:
In lesson or book mode try to use Arrow Keys with/without Ctrl
In books mode also Ctrl + PgUp & PgDown, Shift & End or Home buttons.
F2 -- force layout to change, useful in Lunux if something doesn't work.
Ctrl+Z -- back from Shift+End or Shift+Home.
for deleting book use Ctrl+D.