Use bg color to highlight diagnostics?

[CptPotato]

I've experimented with using git diff colors to highlight LSP diagnostics in the source code, and I quite like the result:

@epbuennig if you don't mind, since you were somewhat involved (#7), what do you think? Does this help visibility and "look good" without being too distracting or do you prefer the background-less version?

[epbuennig]

I think the background certainly helps in the cases where the underlines have the same shape. I personally don't like the style of the text having a light background on it, but that would certainly push me personally to resolve the issues quicker.

Ill have to check at home if it increases visibility on larger code snippets.

I think a style change that helps visibility is more important than over all style preference for me.

[CptPotato]

Thanks for sharing your opinion.

I think I'll leave the themes in this repo unchanged for now, unless there are people who would like to see this change.