fix #3686

demo/client.ts

@@ -548,11 +548,7 @@ function addDecoration() {
   term.options['overviewRulerWidth'] = 15;
   const marker = term.addMarker(1);
   const decoration = term.registerDecoration({ marker, overviewRulerOptions: { color: '#ef2929'} });
-  decoration.onRender((e) => {
-    if (e.classList.value === 'xterm-decoration') {
-      e.style.backgroundColor = '#ef2929';
-    }
-  });
+  decoration.onRender((e) => e.style.backgroundColor = '#ef2929');
 }
 
 function addOverviewRuler() {

src/browser/Decorations/OverviewRulerRenderer.ts

@@ -121,7 +121,6 @@ export class OverviewRulerRenderer extends Disposable {
       this._decorationElements.set(decoration, this._canvas);
     }
     this._refreshStyle(decoration, updateAnchor);
-    decoration.onRenderEmitter.fire(this._canvas);
   }
 
   private _queueRefresh(updateCanvasDimensions?: boolean, updateAnchor?: boolean): void {