check that string passed to FromUTF8() is valid even in release build, this is safer; add a separate FromUTF8Unchecked() which can be used for maximal efficiency

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54721 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/string.h

@@ -44,7 +44,7 @@ inline NSString* wxInitNSStringWithWxString(NSString *nsstring, const wxString &
 inline wxString wxStringWithNSString(NSString *nsstring)
 {
 #if wxUSE_UNICODE
-    return wxString::FromUTF8([nsstring UTF8String]);
+    return wxString::FromUTF8Unchecked([nsstring UTF8String]);
 #else
     return wxString([nsstring lossyCString]);
 #endif // wxUSE_UNICODE