viewerpanelbase: stop playback when panel is defocused

app/window/mainwindow/mainwindow.cpp

@@ -314,9 +314,18 @@ void MainWindow::ToggleMaximizedPanel()
       }
     }
   } else {
+    // Preserve currently focused panel
+    auto currently_focused_panel = PanelManager::instance()->CurrentlyFocused(false);
+
     // Assume we are currently maximized, restore the state
+    PanelManager::instance()->SetSuppressChangedSignal(true);
     restoreState(premaximized_state_);
     premaximized_state_.clear();
+
+    currently_focused_panel->raise();
+    currently_focused_panel->setFocus();
+
+    PanelManager::instance()->SetSuppressChangedSignal(false);
   }
 }