Add icon near row number

[andreymarchenko]

Hello
Is it possible to customize error highliting?
E.g. add icon with error near row number (Can i do it by editor.deltaDecorations?)

[sundaycrafts]

This issue is already done?

see https://microsoft.github.io/monaco-editor/playground.html#interacting-with-the-editor-rendering-glyphs-in-the-margin

I haven't tried yet but I think we can add any images by CSS background-image.