DeliveryAdminWindow: Fix creation of new deliveries

Elwig/Windows/ContextWindow.cs

@@ -30,11 +30,19 @@ namespace Elwig.Windows {
         }
 
         public async void ForceContextReload(object sender, EventArgs evt) {
-            await HintContextChange();
+            await ForceContextReload();
         }
 
-        public async Task HintContextChange() {
+        public async Task ForceContextReload() {
+            HintContextChange();
+            await TryContextReload();
+        }
+
+        public void HintContextChange() {
             _renewPending = true;
+        }
+
+        public async Task TryContextReload() {
             if (LockContext) return;
             await EnsureContextRenewed();
         }
@@ -49,9 +57,9 @@ namespace Elwig.Windows {
 
         protected async Task EnsureContextRenewed() {
             if (!_renewPending) return;
+            _renewPending = false;
             using var ctx = new AppDbContext();
             await OnRenewContext(ctx);
-            _renewPending = false;
         }
 
         virtual protected async Task OnInit(AppDbContext ctx) { }