bug#69547: 29.2; project root directory is wrong for submodules of worktrees

[Patrick Bader]

Hi,

when navigating to a file in a git submodule, the project root stays in 
the parent repository.
If the submodule is part of a git worktree, however, this does not work 
as expected and the project root switches to the directory of the 
submodule itself.

The issue seems to be how project--submodule-p is checking whether the 
current repository is a submodule.
In the worktree case, there is the worktree path between the .git and 
modules directory in the gitfile.
There may also be regular directory names before the .git directory 
apart of "../".

I have attached a patch to fix this.

Best,

Patrick

0001-fix-project-submodule-detection-does-not-work-for-wo.patch
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