Muqtadi committing a makrooh action intentionally
Q: If the follower (muqtadi) intentionally omits a necessary action (wajib) or intentionally commits an action that is prohibitively disliked (makruh tahriman) while praying behind the imam, is it necessary (wajib) for him or her to repeat the prayer? Things like leaving out at-Tahiyyaat, or reciting behind imam, reciting at-Tahiyyaat twice etc.