[format] Use AlignFunctionDeclarations from clang-format 20.1.0 #19753
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Clang-format v20.1.0 and above have a new sub-option
AlignFunctionDeclarations
(part of the optionAlignConsecutiveDeclarations
) (see https://clang.llvm.org/docs/ClangFormatStyleOptions.html).This PR was made to see how clang-formatting some of the core ROOT source would look like with it.
The alignment of functions is actually pretty close to what we expect/want.
However the enums declaration might still benefit from
AlignConsecutiveAssignments
but it would apply to all assignment (which has been controversial).Ubuntu 24 does not have clang-format v20 and thus a bit a gymnastic was needed to install it.
The new sub-option is fatal to older version of clang-format, so we would all be required to use/install clang-format v20 and newer (v21 was just released on August 26).