Fix generation of key events for non-alphabetic keys under Windows.

Don't hardcode the values of VK_OEM_XXX keys which are completely nonsensical
on keyboards with non-US layouts. Use the real unshifted value of the key as
its key code instead -- at least if it's a Latin-1 character. Otherwise, use
WXK_NONE as the key code and pass the character generated by the key as
Unicode character code.

Also generate WXK_NONE events for dead keys to avoid confusing them with the
corresponding normal key events.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65525 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/private/keyboard.h

@@ -25,7 +25,11 @@ namespace wxMSWKeyboard
 // Translate MSW virtual key code to wx key code. lParam is used to distinguish
 // between numpad and extended version of the keys, extended is assumed by
 // default if lParam == 0.
-WXDLLIMPEXP_CORE int VKToWX(WXWORD vk, WXLPARAM lParam = 0);
+//
+// Returns WXK_NONE if translation couldn't be done at all (this happens e.g.
+// for dead keys) or if the key corresponds to a non-ASCII character in which
+// case uc is filled with its Unicode value.
+WXDLLIMPEXP_CORE int VKToWX(WXWORD vk, WXLPARAM lParam = 0, wchar_t *uc = NULL);
 
 // Translate wxKeyCode enum element (passed as int for compatibility reasons)
 // to MSW virtual key code. isExtended is set to true if the key corresponds to