Centralize retained floating panel closing

src/node_panel_floating.cpp

@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "node_panel_floating.h"
+#include "legacy_ui_overlay_services.h"
 #include "log.h"
 
 Node* NodePanelFloating::clone_instantiate() const
@@ -46,7 +47,7 @@ void NodePanelFloating::init_controls()
     m_button_close = find<NodeButton>("button-close");
     m_button_close->on_click = [this](Node*) {
         m_container->remove_all_children();
-        destroy();
+        pp::panopainter::close_legacy_dialog_node(*this);
     };
 }
 
@@ -176,7 +177,7 @@ kEventResult NodePanelFloating::handle_event(Event* e)
             if (m_outline)
             {
                 outline_pos = m_outline->m_pos;
-                m_outline->destroy();
+                pp::panopainter::close_legacy_dialog_node(*m_outline);
             }
             int drop_pos = 0;
             if (m_drop_placeholder)