change looks of gap tile as it's auto-loaded now

src/ui/web/css/timeline.css

@@ -67,3 +67,18 @@ limitations under the License.
     display: flex;
     align-items: center;
 }
+
+.GapView {
+    visibility: hidden;
+    display: flex;
+    padding: 10px 20px;
+}
+
+.GapView.isLoading {
+    visibility: visible;
+}
+
+.GapView > div {
+    flex: 1;
+    margin-left: 10px;
+}

src/ui/web/session/room/timeline/GapView.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import {TemplateView} from "../../../general/TemplateView.js";
+import {spinner} from "../../../common.js";
 
 export class GapView extends TemplateView {
     render(t, vm) {
@@ -22,12 +23,9 @@ export class GapView extends TemplateView {
             GapView: true,
             isLoading: vm => vm.isLoading
         };
-        const label = (vm.isUp ? "🠝" : "🠟") + " fill gap"; //no binding
         return t.li({className}, [
-            t.button({
-                onClick: () => vm.fill(),
-                disabled: vm => vm.isLoading
-            }, label),
+            spinner(t),
+            t.div(vm.i18n`Loading more messages …`),
             t.if(vm => vm.error, t.createTemplate(t => t.strong(vm => vm.error)))
         ]);
     }