Things which render the Salaah Makrooh

Pants below the ankles

Q:

1) If you pull up your pants to ensure that it remains above your ankles before going down for rukhu or sajda, does it break your salaat?

2) If your pants falls below your ankles while reading salaat, does it break your salaat?

3) If you perform salaat with your pants below the ankles, is your salaat valid?

4) what type of movements nullify salaat?

Repeating a Salaah in which a waajib was left out

Q: In some kitaabs like taalifat rashidiyyah it is written that it is mustahab to repeat the salaah prayed behind a faasiq (the one who trim or shave less than a fist lenght) and in ahsanul fatawa it is writen that if the salaah of a muqtadi become makrooh due to the salaah of imaam become makrooh. What is understood is that it is mustahab for the muqtadi to repeat the salaah prayed behind a faasiq. Please confirm?