macos: handle overridden system bindings with no focused window

src/App.zig

@@ -313,6 +313,25 @@ pub fn focusEvent(self: *App, focused: bool) void {
     self.focused = focused;
 }
 
+/// Returns true if the given key event would trigger a keybinding
+/// if it were to be processed. This is useful for determining if
+/// a key event should be sent to the terminal or not.
+pub fn keyEventIsBinding(
+    self: *App,
+    rt_app: *apprt.App,
+    event: input.KeyEvent,
+) bool {
+    _ = self;
+
+    switch (event.action) {
+        .release => return false,
+        .press, .repeat => {},
+    }
+
+    // If we have a keybinding for this event then we return true.
+    return rt_app.config.keybind.set.getEvent(event) != null;
+}
+
 /// Handle a key event at the app-scope. If this key event is used,
 /// this will return true and the caller shouldn't continue processing
 /// the event. If the event is not used, this will return false.