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 curs├ęd 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.