Windows: Don't start a drag when it's a resize

There were a few pixels where you could click where, very near the
border where it would start a drag while it shouldn't.

The drag state machine then was in an invalid state which could lead to
a crash.

Fixes issue #110

src/private/WidgetResizeHandler.cpp

@@ -262,6 +262,7 @@ bool WidgetResizeHandler::handleWindowsNativeEvent(FloatingWindow *w, const QByt
             }
         }
 
+        w->setLastHitTest(*result);
         return *result != 0;
     } else if (msg->message == WM_NCLBUTTONDBLCLK) {
         if ((Config::self().flags() & Config::Flag_DoubleClickMaximizes)) {