Get rid of unnecessary const casts

A pointer to unqualified type are converted implicitly to a more cv-qualified type.

include/wx/propgrid/editors.h

@@ -460,7 +460,7 @@ public:
 
     wxWindow* GetButton( unsigned int i ) { return m_buttons[i]; }
     const wxWindow* GetButton( unsigned int i ) const
-        { return const_cast<const wxWindow*>(m_buttons[i]); }
+        { return m_buttons[i]; }
 
     // Utility function to be used in event handlers.
     int GetButtonId( unsigned int i ) const { return GetButton(i)->GetId(); }

include/wx/propgrid/manager.h

@@ -270,7 +270,7 @@ public:
     const wxPropertyGrid* GetGrid() const
     {
         wxASSERT(m_pPropGrid);
-        return const_cast<const wxPropertyGrid*>(m_pPropGrid);
+        return m_pPropGrid;
     }
 
     // Returns iterator class instance.

include/wx/propgrid/propgrid.h

@@ -1162,7 +1162,7 @@ public:
 
     const wxPGCommonValue* GetCommonValue( unsigned int i ) const
     {
-        return const_cast<const wxPGCommonValue*>(m_commonValues[i]);
+        return m_commonValues[i];
     }
 
     // Returns number of common values.

include/wx/propgrid/propgridiface.h

@@ -305,7 +305,7 @@ public:
 
     const wxPGProperty* GetFirst( int flags = wxPG_ITERATE_ALL ) const
     {
-        return const_cast<const wxPGProperty*>(GetFirst(flags));
+        return GetFirst(flags);
     }
 
     // Returns pointer to a property with given name (case-sensitive).

include/wx/propgrid/propgridpagestate.h

@@ -412,7 +412,7 @@ public:
 
     const wxPGProperty* GetLastItem( int flags = wxPG_ITERATE_DEFAULT ) const
     {
-        return const_cast<const wxPGProperty*>(GetLastItem(flags));
+        return GetLastItem(flags);
     }
 
     // Returns currently selected property.

include/wx/propgrid/props.h

@@ -771,7 +771,7 @@ bool PROPNAME::OnEvent( wxPropertyGrid* propgrid, \
                         wxWindow* primary, wxEvent& event ) \
 { \
     if ( event.GetEventType() == wxEVT_BUTTON ) \
-        return OnButtonClick(propgrid,primary, const_cast<const wxChar*>(CUSTBUTTXT)); \
+        return OnButtonClick(propgrid,primary, CUSTBUTTXT); \
     return false; \
 }