Doing so ensure the proper behaviour. If you connect anything that doesn't do it, you'll still avoid the signal storm.

Thanks for all. I should test it , if it works I will put the code completely here.

Hi, Just a quick note, taking a look at fixing this "fix", I just saw that the latest version of the contrib repository doesn't contain the offending code anymore.

It solved. I have a silly mistake. I call slot when my form is null and does not create. In that example in stackoverflow both form create and they connect the signal and slot . but my second form is null.