Improve display of callstacks while loading from remote

qrenderdoc/Windows/APIInspector.cpp

@@ -180,17 +180,24 @@ void APIInspector::on_apiEvents_itemSelectionChanged()
 
   if(chunk && !chunk->metadata.callstack.isEmpty())
   {
+    ui->callstack->setUpdatesEnabled(false);
+    ui->callstack->clear();
+    ui->callstack->addItem(tr("Loading..."));
+
     if(!m_Ctx.Replay().AsyncAccessInvoke([this, chunk](ICaptureAccess *access) {
          rdcarray<rdcstr> stack = access->GetResolve(chunk->metadata.callstack);
 
          GUIInvoke::call(this, [this, stack]() { addCallstack(stack); });
        }))
     {
-      ui->callstack->setUpdatesEnabled(false);
       ui->callstack->clear();
       ui->callstack->addItem(tr("Callstack resolution not available."));
       ui->callstack->setUpdatesEnabled(true);
     }
+    else
+    {
+      ui->callstack->setUpdatesEnabled(true);
+    }
   }
   else
   {