[core] publish alias since it appears in public function ret type or arg

[ferdymercury]

Fixes #20572

@grasph would this change solve your issue?

[github-actions]

Test Results

    22 files      22 suites   4d 1h 29m 15s ⏱️
 3 780 tests  3 779 ✅ 0 💤 1 ❌
81 229 runs  81 226 ✅ 0 💤 3 ❌

For more details on these failures, see this check.

Results for commit 2742c91.

♻️ This comment has been updated with latest results.

[grasph]

Yes, it does. Thanks. There few other similar cases:

• TList::Remove(const TObjLinkPtr_t &lnk), TObjLink::NextSP(), and TObjOptLink::PrevSP require the protected alias TObjLinkPtr_t
• TBranch::GetIOFeatures and TBranch::SetIOFeatures require the private TIOFeature alias
• TLeaf::GetLeafCountValues requires the protected alias Counts_t
• TGeoFacet::CompactFacet requires the private Vertex_t alias

[silverweed]

Thanks!

[vepadulano]

@pcanal what do you think about this one?