fix(element): fix observer to watch for slides

fixes #7598

Author: nolimits4web

src/core/modules/observer/observer.mjs

@@ -26,10 +26,10 @@ export default function Observer({ swiper, extendParams, on, emit }) {
         window.setTimeout(observerUpdate, 0);
       }
     });
-
     observer.observe(target, {
       attributes: typeof options.attributes === 'undefined' ? true : options.attributes,
-      childList: typeof options.childList === 'undefined' ? true : options.childList,
+      childList:
+        swiper.isElement || (typeof options.childList === 'undefined' ? true : options).childList,
       characterData: typeof options.characterData === 'undefined' ? true : options.characterData,
     });
 

src/swiper-element.mjs

@@ -158,9 +158,7 @@ class SwiperContainer extends ClassToExtend {
 
     // eslint-disable-next-line
     this.swiper = new Swiper(this.shadowRoot.querySelector('.swiper'), {
-      ...(swiperParams.virtual
-        ? {}
-        : { observer: true, observeSlideChildren: this.slideSlots > 0 }),
+      ...(swiperParams.virtual ? {} : { observer: true }),
       ...swiperParams,
       touchEventsTarget: 'container',
       onAny: (name, ...args) => {