Tests Blockwise Visual when there are TABs before the text.
First test for undo working properly when executing commands from a register.
Also test this in an empty buffer.

STARTTEST
:so tiny.vim
G0"ay$k@au
:new
@auY:quit!
GP
/start here$
"by$jjlld
/456$
jj"bP
:/56$/,$-1w! test.out
:qa!
ENDTEST

123456
234567
345678

test text test tex start here
		some text
		test text
test text

OxjAykdd