hs.window.filter stops emitting windowFocused events for application if one window has tabs

[mogenson]

The default hs.window.filter will emit "windowFocused" events for different windows within the same application. Except if one of the windows has multiple tabs. Then, no "windowFocused" events will be emitted for any window within the application, even non-tabbed windows. Closing the window with tabs will restore the window filter behavior.

For example:

1. Subscribe to window events for the default filter:

hs.window.filter.default:subscribe({hs.window.filter.windowFocused}, function(window, app, event) print(window, event) end)

2. Open Finder window 1 and Finder window 2.
3. Switch back and forth and observe that window filter "windowFocused" events are emitted.
4. Open a tab in Finder window 2.
5. Switch back and forth between Finder window 1 and 2 and tabs in Finder window 2. No "windowFocused" events are printed.
6. Switch from Finder to another app, like the HammerSpoon Console. A "windowFocused" event is printed.
7. Close the tab in Finder window 2. Now "windowFocused" events are again printed for each window switch.

Other window filter events, such as "windowResized", work with tabbed windows.

[dmgerman]

I confirm this happens, but I think it seems that the behaviour is related to the creation of the new window if the previous one has tabs. Behaviour is ok if Finder has windows, then another one is created, and tab is added.

Try

hs.window.filter.setLogLevel('verbose')

and see what is going on. The source code for window_filter can be easily edited and reloaded. it is in Hammerspoon.app/Contents/Resources/extensions/hs/