[Feature Request] Automatically fix the use of count to move block lines.

[fovj]

After selecting multiple lines of text with V, using count<A-k> to move lines results in different relative line numbers when the cursor is on the first line versus the last line.

I recorded a GIF to reproduce this:
When the cursor is on the text line 1, 4<A-k> moves exactly to the target text.
When the cursor is on the text line 3, 6<A-k> moves two lines too far.

Because moving the cursor in V mode also changes the relative line number.
This does not occur when moving the current line in normal mode.

This should be automatically corrected based on the number of selected lines.