Auto complete file names in the text controls of wx{File,Dir}PickerCtrl.

There doesn't seem to be any reason not to do this in the controls which we
know are meant for entering file or directory names into them.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68920 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/dirpicker.cpp

@@ -203,7 +203,7 @@ void DirPickerWidgetsPage::RecreatePicker()
 {
     m_sizer->Remove(1);
     CreatePicker();
-    m_sizer->Insert(1, m_dirPicker, 0, wxALIGN_CENTER|wxALL, 5);
+    m_sizer->Insert(1, m_dirPicker, 0, wxEXPAND|wxALL, 5);
 
     m_sizer->Layout();
 }