Fix "Show Details" not changing to "Hide Details" when expanding error

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed behavior of Free-Form Select tool when melding with the canvas, when the selection was off-screen to the left or top (i.e. with negative coordinates).
 - Fixed Polygon tool closing the polygon when clicking quickly but moving between clicks, detected as a double-click.
 - In-progress curves/polygons are now re-colored immediately when a color is selected, instead of only when mousing over the canvas.
+- Fixed "Show Details" button label not changing to "Hide Details" when clicked, in error message dialogs.
 
 ## [0.2.0] - 2023-09-05
 

src/textual_paint/windows.py

@@ -493,7 +493,7 @@ class MessageBox(DialogWindow):
         """Toggle the visibility of the error details."""
         self.details_widget.display = not self.details_widget.display
         button_text = _("Hide Details") if self.details_widget.display else _("Show Details")
-        self.details_button.update(button_text)
+        self.details_button.label = button_text
 
     def on_mount(self):
         """Called when the window is mounted."""