prioritizeKeepingFunctionOutputTogether should Include function opening parenthesis as well as function output

[adam-fowler]

With prioritizeKeepingFunctionOutputTogether set to true, If the line length of a function declaration is one character over the line length limit, formatting moves the function opening brace to the next line. eg

func f(someLongSignature: SomeLongTypes) -> Result {
}

becomes

func f(someLongSignature: SomeLongTypes) -> Result
{
}

Should the opening brace be glued to the function output and force the function parameters to be broken up over multiple lines?

This issue comes from https://forums.swift.org/t/prioritising-breaking-behaviour-in-swift-format/76175

[ahoppen]

Synced to Apple’s issue tracker as rdar://140664934