update page on query string changes

components/GalleryPage.vue

@@ -68,6 +68,23 @@ export default {
     }
   },
 
+  watch: {
+    $route () {
+      if (!query || !query.gallery) { return }
+      const query = this.$route.query
+      const gallery = parseInt(query.gallery)
+      const image = parseInt(query.image) || 0
+
+      if (gallery !== this.activeGalleryIndex) {
+        this.activeRow = gallery
+        this.activeGalleryIndex = gallery
+      }
+      if (image !== this.activeImageIndex) {
+        this.activeImageIndex = image
+      }
+    }
+  },
+
   created () {
     let query = this.$route.query
     this.activeGalleryIndex = query.gallery ? parseInt(query.gallery) : 0