Disallow MultiModal dismissal while loading

ui/src/components/MultiModal.vue

@@ -9,7 +9,7 @@
       <template v-else>
         <figure>
           <figcaption class="tag is-primary">
-            {{ figure_caption }}
+            {{ caption }}
           </figcaption>
           <div class="image is-square">
             <img :src="image_src" alt="Kalender-Bild" />
@@ -30,7 +30,7 @@ export default class extends Vue {
   public active = false;
   public progress = false;
   public image_src = "";
-  public figure_caption = "";
+  public caption = "";
 
   private on_keydown(e: KeyboardEvent) {
     if (e.key == "Escape") this.set_active(false);
@@ -49,13 +49,16 @@ export default class extends Vue {
   }
 
   public set_active(state: boolean) {
+    // Cannot dismiss the "loading" screen
+    if (this.active && this.progress) return;
+
     this.active = state;
   }
 
   public show_image(src: string, caption: string = "") {
     this.progress = false;
     this.image_src = src;
-    this.figure_caption = caption;
+    this.caption = caption;
     this.set_active(true);
   }