From
*visual.txt* For Vim version 7.0. Last change: 2006 Apr 24
second paragraph under ":help v_$" (lines 176-179). This help tag is about
using $ in visual-block mode, which produces a block-visual selection with a
ragged right side.
---8<---
For moving the end of the block many commands can be used, but you cannot
use Ex commands, commands that make changes or abandon the file. Commands
(starting with) ".pPiIaAO&", CTRL-^, "Z", CTRL-], CTRL-T, CTRL-R, CTRL-I
and CTRL-O cause a beep and Visual mode continues.
--->8---
Actual behaviour:
p, P
No beep. Unnamed register is added once. Block is deleted, Visual mode ends.
O
Go to Other corner on the same line, as documented under ":help v_O"
a, i, Z
Beep happens after next key is hit
&, Ctrl-], Ctrl-T, Ctrl-R, Ctrl-I, Ctrl-O
Beep happens immediately
I
No beep. Visual mode ends. Insert happens before top left corner of block.
When <Esc> is hit, insert is propagated to left margin of whole block.
A
No beep. Visual mode ends. Insert happens after top right corner of block.
When <Esc> is hit, insert is propagated to ragged right margin of whole block.
I checked for maps on the above keys, the reply was "No mapping found".
Best regards,
Tony.