Allow closing '>' of multiline nested type arguments to align with the opener (#15171)

[edgarfgp]

Problem

A nested, multiline type-argument list fails to parse when the inner closing > is aligned with the column of the opening type name. Adding one extra space before the > avoids it.

Fixes #15171.

Before

type Terminal =
    abstract onKey:
        IEvent<
            Foo<
                Bar * int
            >          // aligned with 'Foo' → error FS0010: Incomplete structured construct ... in type arguments
        > with get, set

After

type Terminal =
    abstract onKey:
        IEvent<
            Foo<
                Bar * int
            >          // now accepted
        > with get, set

Cause

The closing > at the same column as the enclosing sequence block's start, on a later line, was treated as a block separator (OBLOCKSEP), which broke the type-argument parse. A closing > of a type application is a closing bracket like ) or ], so it now belongs in isSeqBlockElementContinuator alongside RPAREN/RBRACK/RBRACE. Scoped to GREATER true (the type-app close), so the > comparison operator is unaffected.

[github-actions]

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/11.0.100.md	No current pull request URL (#20003) found, please consider adding it