extensions/references-view/src/highlights.ts/EditorHighlights/_show
class EditorHighlights:	private _show(): void {
		const { activeTextEditor: editor } = vscode.window;
		if (!editor || !editor.viewColumn) {
			return;
		}
		if (this._ignore.has(editor.document.uri.toString())) {
			return;
		}
		const [anchor] = this._view.selection;
		if (!anchor) {
			return;
		}
		const ranges = this._delegate.getEditorHighlights(anchor, editor.document.uri);
		if (ranges) {
			editor.setDecorations(this._decorationType, ranges);
		}
	}