Amend gui's to work with touchscreen controls.

src/tree_gui.cpp

@@ -18,6 +18,7 @@
 #include "command_func.h"
 #include "sound_func.h"
 #include "tree_map.h"
+#include "window_func.h"
 
 #include "widgets/tree_widget.h"
 
@@ -58,6 +59,11 @@ public:
 		ResetObjectToPlace();
 	}
 
+	~BuildTreesWindow()
+	{
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
+	}
+
 	/**
 	 * Calculate the maximum size of all tree sprites
 	 * @return Dimension of the largest tree sprite
@@ -171,6 +177,8 @@ public:
 	virtual void OnPlaceObjectAbort()
 	{
 		this->RaiseButtons();
+
+		ResetObjectToPlace();
 	}
 };