Merge branch 'v4' of https://github.com/soukoku/ntwain into v4

src/NTwain/TwainAppSession.TwainState.cs

@@ -377,7 +377,7 @@ partial class TwainAppSession
                 RegisterCallback();
                 State = STATE.S4;
             }
-            return WrapInSTS(rc);
+            return WrapInSTS(rc, forDsm: true);
         });
     }