gistfile1.txt

Note that there are some tricks to make special keys work and escape CSI bytes
in the text.  The |:map| command also does this, thus you must avoid that it
is done twice.  This does not work: >
	:imap <expr> <F3> "<Char-0x611B>"
Because the <Char- sequence is escaped for being a |:imap| argument and then
again for using <expr>.  This does work: >
	:imap <expr> <F3> "\u611B"
Using 0x80 as a single byte before other text does not work, it will be seen
as a special key.