🚀 go-pugleaf

There are several serious problems with that design:

1. It requires the window manager to know about creation of clients.

2. It requires clients to handle mouse enter/exit events and do
complicated things.

3. It does not work at all for grabbed buttons.  The individual
clients to do not know what buttons are grabbed by other clients
(including those grabbed by the window manager) and would not know
what documentation to give for them even if it did know they were
grabbed.

4. Because in X the modifier keys always drastically affect the
meaning of the mouse buttons, a mouse documentation window that
fails to deal with them is a failure.

I think that design does not work.