--- a/src/main_gui.cpp	Tue Jan 29 21:43:22 2008 +0000
+++ b/src/main_gui.cpp	Wed Jan 30 03:34:24 2008 +0000
@@ -176,10 +176,7 @@
 		case  9: ToggleBit(_display_opt, DO_WAYPOINTS);          break;
 		case 10: ToggleBit(_display_opt, DO_FULL_ANIMATION);     break;
 		case 11: ToggleBit(_display_opt, DO_FULL_DETAIL);        break;
-		case 12:
-			ToggleTransparency(TO_TREES);
-			ToggleTransparency(TO_HOUSES);
-			break;
+		case 12:	ToggleTransparency(TO_HOUSES);                  break;
 		case 13: ToggleTransparency(TO_SIGNS);                   break;
 	}
 	MarkWholeScreenDirty();

--- a/src/transparency_gui.cpp	Tue Jan 29 21:43:22 2008 +0000
+++ b/src/transparency_gui.cpp	Wed Jan 30 03:34:24 2008 +0000
@@ -7,6 +7,7 @@
 #include "variables.h"
 #include "transparency.h"
 #include "sound_func.h"
+#include "settings_type.h"
 
 #include "table/sprites.h"
 #include "table/strings.h"
@@ -37,6 +38,11 @@
 			for (uint i = TTW_WIDGET_SIGNS; i < TTW_WIDGET_END; i++) {
 				w->SetWidgetLoweredState(i, IsTransparencySet((TransparencyOption)(i - TTW_WIDGET_SIGNS)));
 			}
+
+			/* Disabling the trees button allows to make it very evident that it has no effect
+			 * upon current situation */
+			w->SetWidgetDisabledState(TTW_WIDGET_TREES, _patches.invisible_trees && IsTransparencySet(TO_HOUSES));
+
 			DrawWindowWidgets(w);
 			break;
 

--- a/src/tree_cmd.cpp	Tue Jan 29 21:43:22 2008 +0000
+++ b/src/tree_cmd.cpp	Wed Jan 30 03:34:24 2008 +0000
@@ -428,7 +428,8 @@
 
 	StartSpriteCombine();
 
-	if (!(IsTransparencySet(TO_TREES) && _patches.invisible_trees)) {
+	/* Do not draw trees when buildings are transparent and when the invisile trees patch is on */
+	if (!(_patches.invisible_trees && IsTransparencySet(TO_HOUSES))) {
 		TreeListEnt te[4];
 		uint i;