fix(ImagePreview): longpress error on mobile safari (#6660)

src/image-preview/index.less

@@ -9,6 +9,12 @@
 
   &__swipe {
     height: 100%;
+
+    &-item {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+    }
   }
 
   &__cover {
@@ -18,13 +24,14 @@
   }
 
   &__image {
-    position: absolute;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    left: 0;
+    width: 100%;
     transition-property: transform;
 
+    &--vertical {
+      width: auto;
+      height: 100%;
+    }
+
     img {
       // disable desktop browser image drag
       -webkit-user-drag: none;