Add icons at the beginning of an editor line

I've seen the override and implement icons in baselanguages editor and really would like to add something similar to my language. But I can't find any place to specify icons for the editor. Is this feature somehow available through normal user interface or do I need to implement a plugin for this?
1 comment
You have to implement plugin. If you need this you can use jetbrains.mps.ide.java.platform.highlighters.OverrideMethodsChecker class from MPS code as a prototype.
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