client/posts: fix adding loop flag to non videos

client/html/post_upload_row.tpl

@@ -60,7 +60,7 @@
                 <%= ctx.makeCheckbox({
                     text: 'Loop video',
                     name: 'loop-video',
-                    checked: true,
+                    checked: ctx.uploadable.flags.includes('loop'),
                 }) %>
             </div>
         <% } %>

client/js/views/post_upload_view.js

@@ -30,7 +30,7 @@ class Uploadable extends events.EventTarget {
     constructor() {
         super();
         this.safety = 'safe';
-        this.flags = ['loop'];
+        this.flags = [];
         this.anonymous = false;
         this.order = globalOrder;
         globalOrder++;
@@ -54,6 +54,12 @@ class Uploadable extends events.EventTarget {
     get name() {
         throw new Error('Not implemented');
     }
+
+    _initComplete() {
+        if (['video'].includes(this.type)) {
+            this.flags.push('loop');
+        }
+    }
 }
 
 class File extends Uploadable {
@@ -73,6 +79,7 @@ class File extends Uploadable {
                     new CustomEvent('finish', {detail: {uploadable: this}}));
             });
         }
+        this._initComplete();
     }
 
     destroy() {
@@ -103,6 +110,7 @@ class Url extends Uploadable {
         super();
         this.url = url;
         this.dispatchEvent(new CustomEvent('finish'));
+        this._initComplete();
     }
 
     get mimeType() {