Add deactivate-unfocused-windows debug flag (#1706)

* force xdg deactivation on invisable workspaces

This debug option provides a workaround for many Chromium-based chat
applications that fail to show notifications when they're active in
a workspace that's not currently visible and don't have keyboard focus

Signed-off-by: Alex Yosifov <sashomasho@gmail.com>

* fixes

---------

Signed-off-by: Alex Yosifov <sashomasho@gmail.com>
Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

niri-config/src/lib.rs

@@ -2351,6 +2351,8 @@ pub struct DebugConfig {
     #[knuffel(child)]
     pub honor_xdg_activation_with_invalid_serial: bool,
     #[knuffel(child)]
+    pub deactivate_unfocused_windows: bool,
+    #[knuffel(child)]
     pub skip_cursor_only_updates_during_vrr: bool,
 }
 
@@ -5324,6 +5326,7 @@ mod tests {
                 disable_monitor_names: false,
                 strict_new_window_focus_policy: false,
                 honor_xdg_activation_with_invalid_serial: false,
+                deactivate_unfocused_windows: false,
                 skip_cursor_only_updates_during_vrr: false,
             },
             workspaces: [