Issue #577: skip informational error output from new plink version

source/dbconnection.pas

@@ -966,6 +966,10 @@ begin
             raise EDatabaseError.Create(_('PLink cancelled'));
           end;
         end;
+      end else if ErrorText.StartsWith('Using username ', True) then begin
+        // See #577 - new plink version sends this informational text to error pipe
+        FConnection.Log(lcError, 'PLink: '+ErrorText);
+        SendText(CRLF);
       end else begin
         MessageDialog('PLink:', ErrorText, mtError, [mbOK]);
       end;