Add strict-new-window-focus-policy debug flag

niri-config/src/lib.rs

@@ -1537,6 +1537,8 @@ pub struct DebugConfig {
     pub keep_laptop_panel_on_when_lid_is_closed: bool,
     #[knuffel(child)]
     pub disable_monitor_names: bool,
+    #[knuffel(child)]
+    pub strict_new_window_focus_policy: bool,
 }
 
 #[derive(knuffel::DecodeScalar, Debug, Clone, Copy, PartialEq, Eq)]

src/handlers/compositor.rs

@@ -145,7 +145,14 @@ impl CompositorHandler for State {
                         .filter(|token| token.timestamp.elapsed() < XDG_ACTIVATION_TOKEN_TIMEOUT)
                     {
                         Some(_) => ActivateWindow::Yes,
-                        None => ActivateWindow::Smart,
+                        None => {
+                            let config = self.niri.config.borrow();
+                            if config.debug.strict_new_window_focus_policy {
+                                ActivateWindow::No
+                            } else {
+                                ActivateWindow::Smart
+                            }
+                        }
                     };
 
                     let output = if let Some(p) = parent {

wiki/Configuration:-Debug-Options.md

@@ -24,6 +24,7 @@ debug {
     disable-transactions
     keep-laptop-panel-on-when-lid-is-closed
     disable-monitor-names
+    strict-new-window-focus-policy
 }
 
 binds {
@@ -194,6 +195,19 @@ debug {
 }
 ```
 
+### `strict-new-window-focus-policy`
+
+<sup>Since: 0.1.11</sup>
+
+Disables heuristic automatic focusing for new windows.
+Only windows that activate themselves with a valid xdg-activation token will be focused.
+
+```kdl
+debug {
+    strict-new-window-focus-policy
+}
+```
+
 ### Key Bindings
 
 These are not debug options, but rather key bindings.