1. Derive wxMessageDialogBase from wxDialog (why did we use multiple

inheritance here?), moved more wxMessageDialog fields into the base class
2. Added functions to set the text of message box buttons (patch 1700393,
   currently only implemented for wxMac)
3. Added wxMessageDialog::SetMessage() and SetExtendedMessage() and
   implemented them for wxMac (part of the patch), wxGTK 2.4+ and in
   a generic way for everybody else
4. Allow changing the dialog attributes between creating and showing it,
   for this the real dialog creation is now done on in ShowModal() in all
   ports


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46199 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -100,6 +100,7 @@ All (GUI):
 - Added wxDC::StretchBlit() for wxMac and wxMSW (Vince Harron)
 - Added support for drop down toolbar buttons (Tim Kosse)
 - Added support for labels for toolbar controls (Vince Harron)
+- Added wxMessageDialog::SetMessage() and SetExtendedMessage()
 - Added wxEventBlocker class (Francesco Montorsi).
 - Added wxFile/DirPickerCtrl::Get/SetFile/DirName() (Francesco Montorsi).
 - Added wxSizerFlags::Top() and Bottom().
@@ -135,6 +136,7 @@ wxGTK:
 wxMac:
 
 - Better IconRef support (Alan Shouls)
+- Added support for changing button labels in wxMessageDialog (Gareth Simpson)
 - Fix duplicate (empty) help menu in non-English programs (Andreas Jacobs)
 - Allow accelerators to be used with buttons too (Ryan Wilcox)
 - Support resource forks in wxCopyFile() (Hank Schultz)