Completion of GHC options in`OPTIONS_GHC` doesn't properly handle `-`s

[konsumlamm]

Your environment

Which version of GHC do you use and how did you install it?

9.8.1 from GHCup

Which version of HLS do you use and how did you install it?

2.5.0.0

Steps to reproduce

{-# OPTIONS_GHC -ddump-simpl -dno-suppr #-}

When typing -dno-suppr, select the -dno-suppress-type-signatures suggestion.

Expected behaviour

{-# OPTIONS_GHC -ddump-simpl -dno-suppress-type-signatures #-}

Actual behaviour

{-# OPTIONS_GHC -ddump-simpl -dno-dno-suppress-type-signatures #-}

[michaelpj]

I suspect it's not so much the dashes as that it's not correctly handling the presence of a partial prefix at all. We should be able to support that!

[konsumlamm]

I think it is the dashes, if I type -ddum and select the -ddump-asm suggestion, it works as expected.