chore: Add documentation about popup opening

main/gui/source/window/window.cpp

@@ -427,6 +427,8 @@ namespace hex {
         }
 
         // Open popups when plugins requested it
+        // We retry every frame until the popup actually opens
+        // It might not open the first time because another popup is already open
         {
             std::scoped_lock lock(m_popupMutex);
             m_popupsToOpen.remove_if([](const auto &name) {