GFM file links across submodules
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Problem to solve
Currently, GFM file links, such as (doc/README), do not work when the target file is actually in a different repository which is included in the current repo as a submodule. E. g., the link (doc/README) will be broken if doc is a submodule.
At least in cases where the submodule is hosted on the same gitlab instance as the current repo, this should work.
Intended users
Everyone accessing GFM files in repos with local submodules, when such files might contain links into such submodules.
Permissions and Security
On a per-link basis, this feature should be made available only to such users that have read access to the current repo and all traversed submodules up to and including the one containing the link target.