Added private wxEVT_AFTER_CHAR event for wxMSW implementation needs.

This event is sent by wxMSW after the default handling of WM_CHAR has taken
place. It can be used to define an event handler triggered by key presses and
having access to the new value of the control, updated to take the last key
press into account.

This event will be used by auto-completion implementation for wxMSW only for
now.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67512 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -599,6 +599,14 @@ protected:
                               WXWPARAM wParam,
                               WXLPARAM lParam = 0) const;
 
+    // Another helper for creating wxKeyEvent for wxEVT_CHAR and related types.
+    //
+    // The wParam and lParam here must come from WM_CHAR event parameters, i.e.
+    // wParam must be a character and not a virtual code.
+    wxKeyEvent CreateCharEvent(wxEventType evType,
+                               WXWPARAM wParam,
+                               WXLPARAM lParam) const;
+
 
     // default OnEraseBackground() implementation, return true if we did erase
     // the background, false otherwise (i.e. the system should erase it)