Backport <host_version:track ref> to Conan v1

[AbrilRBS]

Changelog: Feature: Add tracking of different ref to <host_version>.
Changelog: Bugfix: Make <host_version> only track for same user/channel.
Docs: conan-io/docs#3575

Need to check with the team if we want the bugfix. Conan v2 behaves similarly

[SSE4]

what is track ref in the first place? searching in conan docs provides zero results for that term. and why is it needed to be added to 1.x?

[AbrilRBS]

what is track ref in the first place?

You're right that the PR title is not the most obvious thing (Note that the proper changelog goes into the Changelog entry in the PR body which I think does make sense) - It's meant to represent the ability to track a different ref other than the one being required in the <host_version> instance.

and why is it needed to be added to 1.x?

We need to add this to V1 because CCI needs this fix for libgettext/gettext - and as we're still building v1 & v2 there, backporting this made sense :)

[SSE4]

We need to add this to V1 because CCI needs this fix for libgettext/gettext - and as we're still building v1 & v2 there, backporting this made sense :)

it's still not clear from the PR body Changelog entry, which says Bugfix: Make <host_version> only track for same user/channel. AFAIK CCI doesn't use username and channel at all, so it's unclear what exactly does it fix in the context of CCI.

IMO it needs more explanation of the use-case to make it crystal clear (what's the problem are we trying to solve, what's the command line, and some example how to use host_version:track ref in the recipe).

e.g. from PR diff it looks like tests are using syntax self.tool_requires("protobuf/<host_version>@tool_requires_tag"), while PR title states it should be self.tool_requires("protobuf/<host_version>:tool_requires_tag"), which is confusing right now.

to add more to confusion, PR title uses term ref (I assume short for reference), while code uses term tag for some reason, while in reality it's just username/channel in tests (could it be a full package or recipe reference here? unclear).