Got it. So i can delete the ' c="anything" ' to reject the applications anyway. Thanks!

Something i found may be treated as a bug or not. I noticed that only the title be blured by TT. The bottom and left & right of the window keeps no blured effect. I like to activate all sides with blur. Is it lower the performance too mush? I hope not.

When a window stay beyond anothers, It seems that any layered windows will be cut by blured title when they appeared 'under' it. I also hope that way is just for keeping the machine running fast and taking memory not so mush but not a bug of TT.