Fixes full screen when item's list is inside a container relativelly positioned.

src/admin/pages/lists/items-page.vue

@@ -1536,11 +1536,13 @@
     }
 
     .is-fullscreen {
-        position: absolute;
+        position: fixed;
         top: 0;
         bottom: 0;
         left: 0;
         right: 0;
+        width: 100%;
+        height: 100%;
         width: 100vw;
         height: 100vh;
         z-index: 999999999;

src/admin/pages/lists/term-items-page.vue

@@ -1478,11 +1478,13 @@
     }
 
     .is-fullscreen {
-        position: absolute;
+        position: fixed;
         top: 0;
         bottom: 0;
         left: 0;
         right: 0;
+        width: 100%;
+        height: 100%;
         width: 100vw;
         height: 100vh;
         z-index: 999999999;

src/theme-helper/view-mode-slideshow.vue

@@ -671,6 +671,8 @@ export default {
         flex-wrap: nowrap;
         flex-direction: column;
         justify-content: space-between;
+        width: 100%;
+        height: 100%;
         height: 100vh;
         width: 100vw;
     }