e passive window grabs - fix side-effect leave/enter events on clients

e passive window grabs - fix side-effect leave/enter events on clients

when you have click to focus we have a passive grab set up. somewhere
that window changed to the parent window instead of the client. this
leads to a side effect of a leave and enter event on clients for every
click. generally clients are ok with this, but some seem to have buggy
event handling. these enter/leave events are a side effect of the
passive grab even though we allow/replay the event.

this fixes that by placing passive grabs on the client window itself
instead of the parent.

@fix