Properly set the cursor when opening a dialog.

Fixes bug #12961.

changelog

@@ -17,6 +17,7 @@ Version 1.5.11+svn:
    * Changed the widgets in the in game message dialog
    * The multiplayer dialog shows tooltips again
    * The textbox history now uses CTRL+TAB and CTRL+SHIFT+TAB
+   * Properly set the cursor when opening a dialog (bug #12961)
  * WML Engine:
    * Fix incorrect or doubled "sighted" events when delaying shroud update
    * Fix sometimes doubled "select" events

src/gui/widgets/window.cpp

@@ -21,7 +21,6 @@
 
 #include "gui/widgets/window.hpp"
 
-#include "cursor.hpp"
 #include "font.hpp"
 #include "foreach.hpp"
 #ifdef DEBUG_WINDOW_LAYOUT_GRAPHS
@@ -95,6 +94,7 @@ twindow::twindow(CVideo& video,
 		const std::string& definition)
 	: tpanel()
 	, tevent_handler()
+	, cursor::setter(cursor::NORMAL)
 	, video_(video)
 	, status_(NEW)
 	, retval_(0)

src/gui/widgets/window.hpp

@@ -21,6 +21,7 @@
 #ifndef GUI_WIDGETS_WINDOW_HPP_INCLUDED
 #define GUI_WIDGETS_WINDOW_HPP_INCLUDED
 
+#include "cursor.hpp"
 #include "gui/widgets/event_handler.hpp"
 #include "gui/widgets/formula.hpp"
 #include "gui/widgets/helper.hpp"
@@ -44,7 +45,10 @@ class tdebug_layout_graph;
  * base class of top level items, the only item
  * which needs to store the final canvase to draw on
  */
-class twindow : public tpanel, public tevent_handler
+class twindow 
+	: public tpanel
+	, public tevent_handler
+	, public cursor::setter
 {
 	friend class tdebug_layout_graph;