src/vs/workbench/api/browser/mainThreadEditor.ts/MainThreadTextEditor/setDecorations
class MainThreadTextEditor:	public setDecorations(key: string, ranges: IDecorationOptions[]): void {
		if (!this._codeEditor) {
			return;
		}
		this._codeEditor.setDecorationsByType('exthost-api', key, ranges);
	}