fix(a11y): fix focus in virtual mode enabled

fixes #8147

Author: nolimits4web

src/modules/a11y/a11y.mjs

@@ -249,7 +249,10 @@ export default function A11y({ swiper, extendParams, on }) {
     const slideEl = e.target.closest(`.${swiper.params.slideClass}, swiper-slide`);
     if (!slideEl || !swiper.slides.includes(slideEl)) return;
     focusTargetSlideEl = slideEl;
-    const isActive = swiper.slides.indexOf(slideEl) === swiper.activeIndex;
+    const isVirtual = swiper.virtual && swiper.params.virtual.enabled;
+    const isActive =
+      (isVirtual ? parseInt(slideEl.getAttribute('data-swiper-slide-index'), 10) : swiper.slides.indexOf(slideEl)) ===
+      swiper.activeIndex;
     const isVisible =
       swiper.params.watchSlidesProgress &&
       swiper.visibleSlides &&
@@ -268,6 +271,11 @@ export default function A11y({ swiper, extendParams, on }) {
           swiper.getSlideIndexWhenGrid(parseInt(slideEl.getAttribute('data-swiper-slide-index'))),
           0,
         );
+      } else if (isVirtual) {
+        swiper.slideTo(
+          swiper.getSlideIndexWhenGrid(parseInt(slideEl.getAttribute('data-swiper-slide-index'), 10)),
+          0,
+        );
       } else {
         swiper.slideTo(swiper.getSlideIndexWhenGrid(swiper.slides.indexOf(slideEl)), 0);
       }