Assignment of adjacent strings that respect line length gets new line

[FMorschel]

What input code did you provide to the formatter?

The change was https://dart-review.googlesource.com/c/sdk/+/448221 from 3.5.0 to 3.9.0.

const _deprecationMessageMethodBeingCopied = 'Use `typeParametersInScope` '
    'instead. You can use `methodBeingCopied.typeParameters`.';

What output did the formatter produce?

const _deprecationMessageMethodBeingCopied =
    'Use `typeParametersInScope` '
    'instead. You can use `methodBeingCopied.typeParameters`.';

What output did you expect or want the formatter to produce?

The old output was better since it would still respect the line length.

Anything else we should know?

This is a constant at pkg/analyzer_plugin/lib/utilities/change_builder/change_builder_dart.dart.

Thanks!