Signature help doesn't work for arguments after a lambda argument

[Colengms]

Example code is:

void foo(int a, int b, int c);

void bar()
{
    foo(1, 2, 3);
    foo(1, []() { return 2; }(), 3);
}

If you type over the , before 3 in the first call to foo, signature help is displayed. In the second call to foo, no signature help is displayed. The current implementation of signature help is getting confused by the contents of the lambda.

I'd like to remove a function (involved in the matching), to complete #12795 . The problem doesn't occur in VS. They leverage the TU to detect the function to provide help for semantically. Using this issue to track fixing the bug by implementing an approach equivalent to what VS is doing.

[Colengms]

It looks like this is only an issue in Tag Parser mode, in which case it's not possible to determine the function semantically. I may be able to improve the lexical scan used there, but without parsing it semantically, it might not be possible to address this. Closing.