fix: video preview click next or prev button subtitles not update (fi…

…lebrowser#2423)

(cherry picked from commit 6744cd4)

frontend/src/views/files/Preview.vue

@@ -174,7 +174,6 @@ export default {
       nextLink: "",
       listing: null,
       name: "",
-      subtitles: [],
       fullSize: false,
       showNav: true,
       navTimeout: null,
@@ -208,6 +207,12 @@ export default {
     isResizeEnabled() {
       return resizePreview;
     },
+    subtitles() {
+      if (this.req.subtitles) {
+        return api.getSubtitlesURL(this.req);
+      }
+      return [];
+    },
   },
   watch: {
     $route: function () {
@@ -274,10 +279,6 @@ export default {
         this.autoPlay = false;
       }
 
-      if (this.req.subtitles) {
-        this.subtitles = api.getSubtitlesURL(this.req);
-      }
-
       let dirs = this.$route.fullPath.split("/");
       this.name = decodeURIComponent(dirs[dirs.length - 1]);