[bug] build_requires with different #RREV are not used correctly about conan HOT 2 OPEN

Hi @thorsten-klein

Thanks for your report.

This would be a known limitation of the Conan cache in Conan 1.X, it cannot contain more than 1 different revision for the same package-version simultaneously. Consequently the same dependency graph cannot define nor contain 2 different revisions of the same dependency, and if recipes explicitly define requires or tool-requires including a revision, then users need to make sure to align those revisions.

This limitation of the Conan cache in 1.X was one of the important reasons why the major breaking Conan 2 was necessary, the changes in the cache were simply too large to be able to introduce them in Conan 1, it is basically a completely new cache with different paradigm.

from conan.

Note: When not using --update then I get expected error

ERROR: The '9fe383f0b6264c07feddde68bf57a649' revision recipe in the local cache doesn't match the requested 'Tool/0.1@lasote/stable#29af85a7594ea33bdcf6c58775e52986'. Use '--update' to check in the remote.

I would expect that --update flag downloads the new correct revision on demand. It seems not to do so.

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