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First, I typed 2V to select two lines, and y to yank them. Then I typed 3V, and instead of selecting 3 lines, Vim selects 6 lines. Next I typed 4V and Vim selected 8 lines. It seems that 3 or 4 in the later selections are multiplied by the 2 in the first selection for yanking.
Why is that?
Although it seem counter intuitive, this behaviour seems to be the expected one. From :help V:
[count]V Start Visual mode linewise.
With [count] select the same number of lines as used
for the last Visual operation, but at the current
cursor position, multiplied by [count]. When there
was no previous Visual operation [count] lines are
selected.
To be precise, [count]V select [count] * (lines of last visual operation) lines if and only if last visual operation is linewise (V).
In fact if last visual operation exists, [count]v, [count]V and [count]<c-v> are the same, they select [count] * (visual area of last visual operation) in the same wise mode with last visual operation.
If last visual operation doesn't exist, [count]v select [count]characters to right, [count]V select [count] lines down, [count]<c-v> select the same area with [count]v but in block wise.
