By default, dwm response to client requests to _NET_ACTIVE_WINDOW client messages by setting the urgency bit on the named window.

This patch activates the window instead.

Both behaviours are legitimate according to the cursed spec

One should decide which of these one should perform based on the message senders' untestable claims that it represents the end-user. Setting the urgency bit is the conservative decision. This patch implements the more trusting alternative.

It also allows dwm to work with wmctrl -a and other external window management utilities.