Previously, the `[` and `]` marks always pointed to the yank source
location. After a paste operation, they now correctly point to the start
and end of the pasted text in the destination buffer.

This enables workflows like `v]` to select just-pasted text, and fixes
the `gp` keymap pattern shown in the issue.


Closes https://github.com/zed-industries/zed/issues/56404

Release Notes:

- vim: Made `[` and `]` marks point to the start and end of pasted text
after a paste operation.

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>
Co-authored-by: Tom Houlé <tom@tomhoule.com>