Fix clang compile issue with a missing tempolate arg list (backport)

Apparently, starting with LLVM clang version 20, if you use the template keyword to highlight a sub-element, you have to provide a template argument list. This is true even for a method where the template arguments can be completely determined by the types of the arguments. Fix this problem by providing an empty template arg list (so the compiler knows what is templated but still figures out its own types).

This is a backport of !3274 (merged)

Backport: release-2.0
Backport: release-2.1

Warnings:

• Eligible for the 2.1.x branch.
• Eligible for the 2.2.x branch.

The warnings do not need to be fixed, but it is recommended to do so.

Warnings:

• Eligible for the 2.0.x branch.
• Eligible for the 2.2.x branch.

The warnings do not need to be fixed, but it is recommended to do so.

Warnings:

• Eligible for the 2.1.x branch.
• Eligible for the 2.0.x branch.

The warnings do not need to be fixed, but it is recommended to do so.

@vbolea Can you verify that I am correctly backporting this change for the release branches of 2.0, 2.1, and 2.2 and that everything looks OK to merge this in?

requested review from @vbolea

changed title from Fix clang compile issue with a missing tempolate arg list to Fix clang compile issue with a missing tempolate arg list (backport)

Looks good

+1

Do: merge

mentioned in commit 51939268

mentioned in commit 48e6099f

mentioned in commit 5fe0b41a

merged manually

Do: merge