Vim leaves 5 lines on top/bottom when the commands L, H, M, zb, zt

Hi,

I'd like to know is it the correct behavior of VIM when in diffmode it doesn't handle L, H, M, zb, zt, ... commands according to the documentation. It leaves 5 lines top/bottom respectively.

One might reproduce it with comparing two files via "vim -d first second", scroll 2 pages down and use zb, zt commands in Normal-mode.

So, Is it expected behavior? Does the documentation has any notes about it?

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