split layout.xml into multiple files loaded on demand, update changelog

src/node_popup_menu.cpp

@@ -2,6 +2,7 @@
 #include "log.h"
 #include "node_popup_menu.h"
 #include "node_button_custom.h"
+#include "app.h"
 
 Node* NodePopupMenu::clone_instantiate() const
 {
@@ -54,7 +55,8 @@ kEventResult NodePopupMenu::handle_event(Event* e)
 
 void NodePopupMenu::added(Node* parent)
 {
-    mouse_capture();
+    if (root() == App::I->layout.get(App::I->main_id))
+        mouse_capture();
     m_mouse_ignore = false;
     m_flood_events = true;
     m_capture_children = false;