1- opera has a vertical bar in left side of window ,when user click each point on it, left panel of opera hides
this is very usefull for IDEA user that only by a click can hide all left/right side tool windows
2- properties of module only active if i select node of mudule, but most times i am in inside in tree of mudule and want go to root node to call this command
it make sense that user can call this command from each palce inside of tree of module
3- why if i has no split , command "Mover Editor to Opposite Tab Group" is inactive so i inforced that firstly my tab split horizontally and then again on same tab "Mover Editor to Opposite Tab Group"