Diff file syntax

[huytd]

I noticed that when you open a git patch or diff file, there's no syntax highlight. For example:

I'm not sure if it's my local issue or not, but with other themes, I don't experience this problem.

I can't switch to other colorscheme because I can't tell how much I liked City Lights :(

[fhbenatti]

Suggestion:

"workbench.colorCustomizations": {
    "[City Lights]": { 
      "diffEditor.insertedTextBorder": "#3ad90055",
      "diffEditor.removedTextBorder": "#ee3a4355",
      "diffEditor.insertedTextBackground": "#41a6b524",
      "diffEditor.removedTextBackground": "#db4b4b22",
   }
}