separate global tick from draw so on tick any node can request a redraw

src/node.cpp

@@ -35,6 +35,11 @@
 #include "node_changelog.h"
 #include "node_usermanual.h"
 
+void Node::app_redraw()
+{
+    App::I.redraw = true;
+}
+
 void Node::async_start()
 {
     App::I.async_start();