Use pre-increment operator to increment iterator in the loop.

When the return value is ignored, the ++it is never less efficient than the it++.

src/propgrid/property.cpp

@@ -2358,7 +2358,7 @@ void wxPGProperty::RemoveChild( wxPGProperty* p )
     wxArrayPGProperty::iterator it;
     wxArrayPGProperty& children = m_children;
 
-    for ( it=children.begin(); it != children.end(); it++ )
+    for ( it=children.begin(); it != children.end(); ++it )
     {
         if ( *it == p )
         {

src/propgrid/propgrid.cpp

@@ -908,7 +908,7 @@ bool wxPropertyGrid::AddToSelectionFromInputEvent( wxPGProperty* prop,
 
         for ( it = GetIterator(wxPG_ITERATE_VISIBLE, startFrom);
               !it.AtEnd();
-              it++ )
+              ++it )
         {
             wxPGProperty* p = *it;
 
@@ -5602,7 +5602,7 @@ void wxPropertyGrid::ClearActionTriggers( int action )
 
         for ( it = m_actionTriggers.begin();
               it != m_actionTriggers.end();
-              it++ )
+              ++it )
         {
             if ( it->second == action )
             {

src/propgrid/props.cpp

@@ -883,7 +883,7 @@ const wxString& wxPropertyGrid::DoubleToString(wxString& target,
         bool isZero = true;
         wxString::const_iterator i = target.begin() + 1;
 
-        for ( ; i != target.end(); i++ )
+        for ( ; i != target.end(); ++i )
         {
             if ( *i != wxS('0') && *i != wxS('.') && *i != wxS(',') )
             {