Api: "view-unfocused" signal

[timgott]

In the code of the shadows plugin, I cannot get a reliable signal when view->activated is changed to false to check whether a view matches the configured condition.

The plugin connects to the output's view-focused signal and remembers the last focused window. However, on my secondary display, once a new window is focused the previously focused window still has view->activated == true set, and the view_matcher does not recognize that the state of the old window has changed. (Only on my secondary display; activated is false on the old window when the new window is on my laptop display)

I propose to add a view-unfocused signal that is triggered after view->activated = false has been set on a window. This would also remove the need to track the last focused window.

Alternatively, it would be even nicer to directly get a signal when a view_matcher condition matches/unmatches a view, as the plugin wouldn't have to handle signals unrelated to its functionality, but currently that is probably not worth the effort.

[ammen99]

There is now a view_activated_state_signal in latest master.