fox for nested heights

src/textual/widget.py

@@ -2175,8 +2175,14 @@ class Widget(DOMNode):
 
         if layout:
             self._layout_required = True
-            if isinstance(self._parent, Widget):
+            for ancestor in self.ancestors:
-                self._parent._clear_arrangement_cache()
+                if not isinstance(ancestor, Widget):
+                    break
+                if ancestor.styles.auto_dimensions:
+                    for ancestor in self.ancestors_with_self:
+                        if isinstance(ancestor, Widget):
+                            ancestor._clear_arrangement_cache()
+                    break
 
         if repaint:
             self._set_dirty(*regions)

tests/snapshot_tests/snapshot_apps/nested_auto_heights.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+from __future__ import annotations
+
+from textual.app import App, ComposeResult
+from textual.containers import Vertical
+from textual.widgets import Static
+
+
+class NestedAutoApp(App[None]):
+    CSS = """
+    Screen {
+        background: red;
+    }
+
+    #my-static-container {
+        border: heavy lightgreen;
+        background: green;
+        height: auto;
+        max-height: 10;
+    }
+
+    #my-static-wrapper {
+        border: heavy lightblue;
+        background: blue;
+        width: auto;
+        height: auto;
+    }
+
+    #my-static {
+        border: heavy gray;
+        background: black;
+        width: auto;
+        height: auto;
+    }
+    """
+    BINDINGS = [
+        ("1", "1", "1"),
+        ("2", "2", "2"),
+        ("q", "quit", "Quit"),
+    ]
+
+    def compose(self) -> ComposeResult:
+        self._static = Static("", id="my-static")
+        yield Vertical(
+            Vertical(
+                self._static,
+                id="my-static-wrapper",
+            ),
+            id="my-static-container",
+        )
+
+    def action_1(self) -> None:
+        self._static.update(
+            "\n".join(f"Lorem {i} Ipsum {i} Sit {i}" for i in range(1, 21))
+        )
+
+    def action_2(self) -> None:
+        self._static.update("JUST ONE LINE")
+
+
+if __name__ == "__main__":
+    app = NestedAutoApp()
+    app.run()

tests/snapshot_tests/test_snapshots.py

@@ -101,7 +101,9 @@ def test_header_render(snap_compare):
 
 
 def test_list_view(snap_compare):
-    assert snap_compare(WIDGET_EXAMPLES_DIR / "list_view.py", press=["tab", "down", "down", "up"])
+    assert snap_compare(
+        WIDGET_EXAMPLES_DIR / "list_view.py", press=["tab", "down", "down", "up"]
+    )
 
 
 def test_textlog_max_lines(snap_compare):
@@ -160,6 +162,11 @@ def test_offsets(snap_compare):
     assert snap_compare("snapshot_apps/offsets.py")
 
 
+def test_nested_auto_heights(snap_compare):
+    """Test refreshing widget within a auto sized container"""
+    assert snap_compare("snapshot_apps/nested_auto_heights.py", press=["1", "2"])
+
+
 # --- Other ---