Index: gtk2_ardour/automation_time_axis.cc
===================================================================
--- gtk2_ardour/automation_time_axis.cc	(revision 3577)
+++ gtk2_ardour/automation_time_axis.cc	(working copy)
@@ -302,7 +302,7 @@
 AutomationTimeAxisView::set_height (uint32_t h)
 {
 	bool changed = (height != (uint32_t) h);
-	bool changed_between_small_and_normal = ( (h == hSmall || h == hSmaller) ^ (height == hSmall || height == hSmaller) );
+	bool changed_between_small_and_normal = ( (height < hNormal && h >= hNormal) || (height >= hNormal || h < hNormal) );
 
 	TimeAxisView* state_parent = get_parent_with_state ();
 	XMLNode* xml_node = state_parent->get_child_xml_node (_state_name);