fixup! fix(material-experimental/mdc-slider): sync ui on mouseenter

Author: wagnermaciel

src/material-experimental/mdc-slider/slider.ts

@@ -701,16 +701,22 @@ export class MatSlider extends _MatSliderMixinBase
     // "mousedown" as the default for when a browser does not support pointer events. While we
     // would prefer to use "mousedown" as the default, for some reason it does not work (the
     // callback is never triggered).
-    const evtType = this._SUPPORTS_POINTER_EVENTS ? 'pointerdown' : 'mouseenter';
-    this._elementRef.nativeElement.addEventListener(evtType, this._layout);
-    this._elementRef.nativeElement.addEventListener('touchstart', this._layout);
+    if (this._SUPPORTS_POINTER_EVENTS) {
+      this._elementRef.nativeElement.addEventListener('pointerdown', this._layout);
+    } else {
+      this._elementRef.nativeElement.addEventListener('mouseenter', this._layout);
+      this._elementRef.nativeElement.addEventListener('touchstart', this._layout);
+    }
   }
 
   /** Removes the event listener that keeps sync the slider UI and the foundation in sync. */
   _removeUISyncEventListener(): void {
-    const evtType = this._SUPPORTS_POINTER_EVENTS ? 'pointerdown' : 'mouseenter';
-    this._elementRef.nativeElement.removeEventListener(evtType, this._layout);
-    this._elementRef.nativeElement.removeEventListener('touchstart', this._layout);
+    if (this._SUPPORTS_POINTER_EVENTS) {
+      this._elementRef.nativeElement.removeEventListener('pointerdown', this._layout);
+    } else {
+      this._elementRef.nativeElement.removeEventListener('mouseenter', this._layout);
+      this._elementRef.nativeElement.removeEventListener('touchstart', this._layout);
+    }
   }
 
   /** Wrapper function for calling layout (needed for adding & removing an event listener). */