src/vs/workbench/browser/codeeditor.ts/RangeHighlightDecorations/highlightRange
class RangeHighlightDecorations:	highlightRange(range: IRangeHighlightDecoration, editor?: any) {
		editor = editor ?? this.getEditor(range);
		if (isCodeEditor(editor)) {
			this.doHighlightRange(editor, range);
		} else if (isCompositeEditor(editor) && isCodeEditor(editor.activeCodeEditor)) {
			this.doHighlightRange(editor.activeCodeEditor, range);
		}
	}