Fix for IDEA-214698

src/java.desktop/windows/native/libawt/windows/awt_Frame.cpp

@@ -1794,9 +1794,11 @@ MsgRouting AwtFrame::WmNcCalcSize(BOOL wParam, LPNCCALCSIZE_PARAMS lpncsp, LRESU
     if (::IsZoomed(GetHWnd())) {
         rect->top += insets.bottom;
         // [moklev] Workaround for RIDER-27069, IDEA-211327
+        if (!this->IsUndecorated()) {
             rect->right += this->ScaleUpX(1);
             rect->bottom -= 1;
         }
+    }
     else {
         // this makes the native caption go uncovered
         // int yBorder = ::GetSystemMetrics(SM_CYBORDER);