fix refresh on remove (#2008)

* fix refresh on remove

* changelog

* optimization

* added snapshot

tests/snapshot_tests/snapshot_apps/remove_auto.py

@@ -0,0 +1,38 @@
+from textual.app import App, ComposeResult
+from textual.containers import Vertical
+from textual.widgets import Header, Footer, Label
+
+
+class VerticalRemoveApp(App[None]):
+    CSS = """
+    Vertical {
+        border: round green;
+        height: auto;
+    }
+
+    Label {
+        border: round yellow;
+        background: red;
+        color: yellow;
+    }
+    """
+    BINDINGS = [
+        ("a", "add", "Add"),
+        ("d", "del", "Delete"),
+    ]
+
+    def compose(self) -> ComposeResult:
+        yield Header()
+        yield Vertical()
+        yield Footer()
+
+    def action_add(self) -> None:
+        self.query_one(Vertical).mount(Label("This is a test label"))
+
+    def action_del(self) -> None:
+        if self.query_one(Vertical).children:
+            self.query_one(Vertical).children[-1].remove()
+
+
+if __name__ == "__main__":
+    VerticalRemoveApp().run()

tests/snapshot_tests/test_snapshots.py

@@ -170,9 +170,11 @@ def test_content_switcher_example_initial(snap_compare):
 
 
 def test_content_switcher_example_switch(snap_compare):
-    assert snap_compare(WIDGET_EXAMPLES_DIR / "content_switcher.py", press=[
-        "tab", "tab", "enter", "wait:500"
-    ], terminal_size=(50, 50))
+    assert snap_compare(
+        WIDGET_EXAMPLES_DIR / "content_switcher.py",
+        press=["tab", "tab", "enter", "wait:500"],
+        terminal_size=(50, 50),
+    )
 
 
 # --- CSS properties ---
@@ -234,6 +236,7 @@ def test_programmatic_scrollbar_gutter_change(snap_compare):
 # --- CLI Preview Apps ---
 # For our CLI previews e.g. `textual easing`, `textual colors` etc, we have snapshots
 
+
 def test_borders_preview(snap_compare):
     assert snap_compare(CLI_PREVIEWS_DIR / "borders.py", press=["tab", "enter"])
 
@@ -296,3 +299,9 @@ def test_focus_component_class(snap_compare):
 
 def test_line_api_scrollbars(snap_compare):
     assert snap_compare(SNAPSHOT_APPS_DIR / "line_api_scrollbars.py")
+
+
+def test_remove_with_auto_height(snap_compare):
+    assert snap_compare(
+        SNAPSHOT_APPS_DIR / "remove_auto.py", press=["a", "a", "a", "d", "d"]
+    )