Pinned packages created by "opam switch create ." should be kept up-to-date with the current git branch

[kit-ty-kate]

$ git clone <my-ocaml-project> -b main
$ cd my-ocaml-project
$ opam switch create .
[creates a local switch and pin the project packages in it]
$ opam switch -c test
$ git branch -D main
$ opam update --dev

<><> Synchronising development packages <><><><><><><><><><><><><><><><><><>  🐫
[ERROR] Could not synchronize [....]
[mypkg] fetching sources failed: [...]

The git branch -D is only here to highlight the problem.
The issue is that the info from the opam files can be out-of-date or plain wrong.

In my opinion there should be an automated by of detecting that the pinned packages from the local directory in a local switch should be changed. opam update or opam install might be good places to check that and automatically change it.
There might need to be a new flag on pinned packages to tell it has been automatically added by opam and not manually by the user to avoid overwritting the user’s will.

[AltGr]

Proposed solution (discussed together):

• opam switch create . should pin to HEAD rather than current branch
• For consistency, on later opam install . or opam pin, we should detect new pins to the switch-root directory (or a child ?) and direct them to HEAD rather than current branch
• opam update could print a warning when the opam files present changed ?