[JW Lua] Changing the undo text on the fly

[Jan Angermüller]

Jari, that's great news !

BTW, did you have a look at the undo issues I posted once (19th of 
February and 2nd of April) ?
I think both issues have to do with a FCFontPrefs:SetFontInfo().
It looks to me that calling this already starts a new undo block under 
certain circumstances which I haven't found out yet.
Sometimes I have to press up to 8 times (!) undo, to remove the last JW 
Lua plugin-undo entry that works with some font adjustments.

Best regards,
Jan