For those who'd like to use their mouse scroll wheel to scroll the tool panel, there's a new option in Preference to disable the vertical scrollbar (see issue 735). The side effect of that is better stability of the curve editor's size.

rtgui/guiutils.h

@@ -71,6 +71,14 @@ public:
 	}
 };
 
+class MyScrolledWindow : public Gtk::ScrolledWindow {
+
+	bool on_scroll_event (GdkEventScroll* event);
+
+public:
+	MyScrolledWindow();
+};
+
 class MyComboBox : public Gtk::ComboBox {
 
 	bool on_scroll_event (GdkEventScroll* event);