Fix hover flicker

CHANGELOG.md

@@ -11,10 +11,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fixed `TextArea` cursor display on wrapped lines https://github.com/Textualize/textual/pull/6196
 - Fixed `remove_children` not refreshing layout https://github.com/Textualize/textual/pull/6206
+- Fixed flicker with :hover pseudo class https://github.com/Textualize/textual/pull/6214
 
 ### Added
 
 - Added `grid_size` property to `GridLayout` https://github.com/Textualize/textual/pull/6210
+- Exposed `NoSelection` and `BLANK` via `textual.widgets.select` https://github.com/Textualize/textual/pull/6214
+
+### Changed
+
+- Change highlight style of Select to only highlight the border, not the label https://github.com/Textualize/textual/pull/6214
 
 ## [6.5.0] - 2025-10-31
 

src/textual/app.py

@@ -3037,11 +3037,17 @@ def _set_mouse_over(
                         widget.post_message(events.Enter(widget))
                 finally:
                     self.mouse_over = widget
-        if self.hover_over is not None:
-            self.hover_over.mouse_hover = False
+
+        current_hover_over = self.hover_over
+        if current_hover_over is not None:
+            current_hover_over.mouse_hover = False
+
         if hover_widget is not None:
             hover_widget.mouse_hover = True
-
+            if hover_widget._has_hover_style:
+                hover_widget._update_styles()
+        if current_hover_over is not None and current_hover_over._has_hover_style:
+            current_hover_over._update_styles()
         self.hover_over = hover_widget
 
     def _update_mouse_over(self, screen: Screen) -> None:

src/textual/widget.py

@@ -3963,11 +3963,6 @@ def post_render(
 
         return renderable
 
-    def watch_mouse_hover(self, _mouse_over: bool) -> None:
-        """Update from CSS if mouse over state changes."""
-        if self._has_hover_style:
-            self._update_styles()
-
     def watch_has_focus(self, _has_focus: bool) -> None:
         """Update from CSS if has focus state changes."""
         self._update_styles()

src/textual/widgets/_toggle_button.py

@@ -64,6 +64,15 @@ class ToggleButton(Static, can_focus=True):
         &.-textual-compact {
             border: none !important;
             padding: 0;
+            &:focus {
+                border: tall $border;
+                background-tint: $foreground 5%;
+                & > .toggle--label {
+                    color: $block-cursor-foreground;
+                    background: $block-cursor-background;
+                    text-style: $block-cursor-text-style;
+                }
+            }
         }
 
         & > .toggle--button {
@@ -80,9 +89,7 @@ class ToggleButton(Static, can_focus=True):
             border: tall $border;
             background-tint: $foreground 5%;
             & > .toggle--label {
-                color: $block-cursor-foreground;
-                background: $block-cursor-background;
-                text-style: $block-cursor-text-style;
+                color: $block-cursor-foreground;                
             }
         }
         &:blur:hover {

src/textual/widgets/select.py

@@ -1,3 +1,8 @@
-from textual.widgets._select import EmptySelectError, InvalidSelectValueError
+from textual.widgets._select import (
+    BLANK,
+    EmptySelectError,
+    InvalidSelectValueError,
+    NoSelection,
+)
 
-__all__ = ["EmptySelectError", "InvalidSelectValueError"]
+__all__ = ["EmptySelectError", "InvalidSelectValueError", "NoSelection", "BLANK"]