Renamed ActorSelectionOverlay._render() to _refresh_display() to avoid
shadowing the Textual Widgets internal _render method. The overlay class
inherits from textual.widgets.Static which has its own _render for rendering
widget content. Shadowing this caused incorrect repaint behavior and
interfered with Textual layout pass, resulting in
AttributeError: 'NoneType' object has no attribute 'get_height'.

Also added a TDD regression test (tdd_actor_selection_render_rename.feature)
and fixed CHANGELOG.md by moving the ActorSelectionOverlay entry under the
### Fixed subsection within [Unreleased].

ISSUES CLOSED: #11039

@@ -43,3 +43,4 @@ Below are some of the specific details of various contributions.
 * HAL 9000 has contributed the agents plan rollback command (PR #8674 / issue #8557): implemented checkpoint-based plan state restoration with the `agents plan rollback <plan-id> [<checkpoint-id>]` CLI command as part of Epic #8493, enabling plans to be restored to previous checkpoints, discarding post-checkpoint decisions, and resuming execution from the rolled-back state. Supported by `--yes/-y`, `--to-checkpoint`, and `--format/-f` flags. Includes comprehensive BDD test coverage (>= 97%) for rollback, decision discarding, and plan resume functionality.
 * HAL 9000 has contributed the PyYAML security upgrade (PR #11012 / issue #9055): added `pyyaml>=6.0.3` dependency constraint to address known YAML parsing vulnerabilities.
 * HAL 9000 has contributed the A2A module rename standardization BDD tests (PR #10583 / issue #8615): comprehensive Behave test suite validating that all 22 A2A symbols are properly exported from `cleveragents.a2a`, no legacy ACP references remain in the module source, and documentation uses correct A2A naming conventions — fixing inline imports, unused behave symbols, cross-scenario context dependencies, and missing type annotations.
+* HAL 9000 has contributed rename of `ActorSelectionOverlay._render` to `_refresh_display` to avoid shadowing Textual Widget internal method (PR #11042).

@@ -0,0 +8,4 @@
+
+import sys
+from types import ModuleType
+from unittest.mock import MagicMock, PropertyMock, patch

@@ -0,0 +80,4 @@
+
+
+@given("a new ActorSelectionOverlay")
+def step_new_overlay(context: object) -> None:

@@ -0,0 +99,4 @@
+# ---------------------------------------------------------------------------
+
+
+@when("I call show on the overlay")

@@ -0,0 +130,4 @@
+    # Verify _render is NOT overridden by ActorSelectionOverlay itself.
+    # It may be inherited from Static but that's fine — we must not shadow it.
+    own_methods = list(type(overlay).__dict__.keys())
+    render_shadowed = "_render" in own_methods and "_render" not in [

@@ -219,3 +219,3 @@
     # ------------------------------------------------------------------
 
-    def _render(self) -> None:
+    def _refresh_display(self) -> None:

@@ -43,3 +43,4 @@ Below are some of the specific details of various contributions.
 * HAL 9000 has contributed the agents plan rollback command (PR #8674 / issue #8557): implemented checkpoint-based plan state restoration with the `agents plan rollback <plan-id> [<checkpoint-id>]` CLI command as part of Epic #8493, enabling plans to be restored to previous checkpoints, discarding post-checkpoint decisions, and resuming execution from the rolled-back state. Supported by `--yes/-y`, `--to-checkpoint`, and `--format/-f` flags. Includes comprehensive BDD test coverage (>= 97%) for rollback, decision discarding, and plan resume functionality.
 * HAL 9000 has contributed the PyYAML security upgrade (PR #11012 / issue #9055): added `pyyaml>=6.0.3` dependency constraint to address known YAML parsing vulnerabilities.
 * HAL 9000 has contributed the A2A module rename standardization BDD tests (PR #10583 / issue #8615): comprehensive Behave test suite validating that all 22 A2A symbols are properly exported from `cleveragents.a2a`, no legacy ACP references remain in the module source, and documentation uses correct A2A naming conventions — fixing inline imports, unused behave symbols, cross-scenario context dependencies, and missing type annotations.
+* HAL 9000 has contributed rename of `ActorSelectionOverlay._render` to `_refresh_display` to avoid shadowing Textual Widget internal method (PR #11042).

@@ -0,0 +8,4 @@
+
+import sys
+from types import ModuleType
+from unittest.mock import MagicMock, PropertyMock, patch

@@ -0,0 +130,4 @@
+    # Verify _render is NOT overridden by ActorSelectionOverlay itself.
+    # It may be inherited from Static but that's fine — we must not shadow it.
+    own_methods = list(type(overlay).__dict__.keys())
+    render_shadowed = "_render" in own_methods and "_render" not in [

@@ -0,0 +1,23 @@
+@tdd_issue @tdd_issue_11039

@@ -219,3 +219,3 @@
     # ------------------------------------------------------------------
 
-    def _render(self) -> None:
+    def _refresh_display(self) -> None:

@@ -43,3 +43,4 @@ Below are some of the specific details of various contributions.
 * HAL 9000 has contributed the agents plan rollback command (PR #8674 / issue #8557): implemented checkpoint-based plan state restoration with the `agents plan rollback <plan-id> [<checkpoint-id>]` CLI command as part of Epic #8493, enabling plans to be restored to previous checkpoints, discarding post-checkpoint decisions, and resuming execution from the rolled-back state. Supported by `--yes/-y`, `--to-checkpoint`, and `--format/-f` flags. Includes comprehensive BDD test coverage (>= 97%) for rollback, decision discarding, and plan resume functionality.
 * HAL 9000 has contributed the PyYAML security upgrade (PR #11012 / issue #9055): added `pyyaml>=6.0.3` dependency constraint to address known YAML parsing vulnerabilities.
 * HAL 9000 has contributed the A2A module rename standardization BDD tests (PR #10583 / issue #8615): comprehensive Behave test suite validating that all 22 A2A symbols are properly exported from `cleveragents.a2a`, no legacy ACP references remain in the module source, and documentation uses correct A2A naming conventions — fixing inline imports, unused behave symbols, cross-scenario context dependencies, and missing type annotations.
+* HAL 9000 has contributed rename of `ActorSelectionOverlay._render` to `_refresh_display` to avoid shadowing Textual Widget internal method (PR #11042).

@@ -0,0 +8,4 @@
+
+import sys
+from types import ModuleType
+from unittest.mock import MagicMock, PropertyMock, patch

@@ -0,0 +80,4 @@
+
+
+@given("a new ActorSelectionOverlay")
+def step_new_overlay(context: object) -> None:

@@ -0,0 +99,4 @@
+# ---------------------------------------------------------------------------
+
+
+@when("I call show on the overlay")