[layout][bugfix] Horizontal & Vertical layouts shouldn't display children that have display: none

tests/layouts/test_common_layout_features.py

@@ -0,0 +1,30 @@
+import pytest
+from textual.dom import NodeList
+from textual.screen import Screen
+from textual.widget import Widget
+
+
+@pytest.mark.parametrize(
+    "layout,display,expected_in_displayed_children",
+    [
+        ("dock", "block", True),
+        ("horizontal", "block", True),
+        ("vertical", "block", True),
+        ("dock", "none", False),
+        ("horizontal", "none", False),
+        ("vertical", "none", False),
+    ],
+)
+def test_nodes_take_display_property_into_account_when_they_display_their_children(
+    layout: str, display: str, expected_in_displayed_children: bool
+):
+    widget = Widget(name="widget that might not be visible 🥷 ")
+    widget.styles.display = display
+
+    screen = Screen()
+    screen.styles.layout = layout
+    screen.add_child(widget)
+
+    displayed_children = screen.displayed_children
+    assert isinstance(displayed_children, NodeList)
+    assert (widget in screen.displayed_children) is expected_in_displayed_children