congratulate myself!
Margin on my PW2 5.4.2.1 has just removed. It's kind of weird because after installing JailBreak I tried to install
ready-made files which are designed for 5.4.2 not 5.4.2.1 so installation proceeded by putting bin and margin related jar file in root but nothing happened. in fact, I forgot to restart the device. So, I thought that this in not gonna work and uninstalled it. story goes on!
I continued installing KAUL and its prerequisites and some fancy extensions. device restarted. and here is the magic. I noticed that margin removed in PDF context.
I don't know exactly what happened but I'm happy
you guys are great.