Re: Bug with splits in new nvimdiff layout

> To recreate this, start with a merge conflict, and merge with this command:
>
>     git mergetool --tool=nvimdiff
>
> I expected the layout to be:
>
>     ------------------------------------------
>     |             |           |              |
>     |   LOCAL     |   BASE    |   REMOTE     |
>     |             |           |              |
>     ------------------------------------------
>     |                                        |
>     |                MERGED                  |
>     |                                        |
>     ------------------------------------------
>
> The layout when I ran the command was:
>
>     ------------------------------------------
>     |                                        |
>     |                LOCAL                   |
>     |                                        |
>     ------------------------------------------
>     |             |           |              |
>     |   LOCAL     |   LOCAL   |   MERGED     |
>     |             |           |              |
>     ------------------------------------------
>
> I expected the layout to be the same as what was documented to be the default
> for "nvimdiff".
>
> In my init.vim configuration file, I have these lines set:
>
>     set splitbelow
>     set splitright
>
> These options globally change the behaviour of the "split" command so that
> instead of "split" creating a new window above the current window, or to the
> left when used with "vertical", it does the opposite. Docs:
> https://neovim.io/doc/user/options.html#'splitbelow'
>
> I recommend using the "leftabove" (a.k.a "aboveleft") command together with
> "split". Since these windows are positioned absolutely (according to
> "mergetool.nvimdiff.layout"), it shouldn't depend on the user's configuration.
> Docs: https://neovim.io/doc/user/windows.html#:leftabove
>
> The previous invocation (i.e. "4wincmd w | wincmd J") didn't run into this
> issue, since its not affected by the "splitbelow" and "splitright" options.
>
> Hope this helps,
>
> Matthew
>
> [System Info]
> git version:
> git version 2.37.0
> cpu: x86_64
> no commit associated with this build
> sizeof-long: 8
> sizeof-size_t: 8
> shell-path: /bin/sh
> uname: Linux 5.18.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Sat, 02 Jul 2022
> 21:03:06 +0000 x86_64
> compiler info: gnuc: 12.1
> libc info: glibc: 2.35
> $SHELL (typically, interactive shell): /bin/bash
>
>
> [Enabled Hooks]