exclude invisible widgets

sandbox/will/spacing.css

@@ -9,4 +9,5 @@ Static {
     height: 100%;
     margin: 2 4;
     min-width: 30;
+    visibility: hidden;
 }

sandbox/will/spacing.py

@@ -2,9 +2,14 @@ from textual.app import App
 from textual.widgets import Static
 
 
+class Clickable(Static):
+    def on_click(self):
+        self.app.bell()
+
+
 class SpacingApp(App):
     def compose(self):
-        yield Static()
+        yield Clickable()
 
 
 app = SpacingApp(css_path="spacing.css")