changelog

Author: willmcgugan

CHANGELOG.md

@@ -13,11 +13,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fixed height of auto container which contains auto height children https://github.com/Textualize/textual/pull/5552
 - Fixed `Content.from_markup` not stripping control codes https://github.com/Textualize/textual/pull/5557
 - Fixed `delta_x` and `delta_y` in mouse events when smooth scrolling is enabled https://github.com/Textualize/textual/pull/5556
+- Fixed detection of smooth scrolling
 
 ### Added
 
 - Added `pointer_x`, `pointer_y`, `pointer_screen_x`, and `pointer_screen_y` attributes to mouse events https://github.com/Textualize/textual/pull/5556
 
+### Changed
+
+- Animating the scrollbar while dragging is disabled if smooth scrolling is available
+
 ## [2.0.4] - 2025-02-17
 
 ### Fixed

src/textual/app.py

@@ -795,7 +795,7 @@ def __init__(
         self._clipboard: str = ""
         """Contents of local clipboard."""
 
-        self.supports_smooth_scrolling: bool = True
+        self.supports_smooth_scrolling: bool = False
         """Does the terminal support smooth scrolling?"""
 
         if self.ENABLE_COMMAND_PALETTE:
@@ -4654,7 +4654,7 @@ def _on_terminal_supports_in_band_window_resize(
         """There isn't much we can do with this information currently, so
         we will just log it.
         """
-        self.supports_smooth_scrolling = True
+        self.supports_smooth_scrolling = message.enabled
         self.log.debug(message)
 
     def _on_idle(self) -> None:

src/textual/scrollbar.py

@@ -379,7 +379,9 @@ async def _on_mouse_move(self, event: events.MouseMove) -> None:
                     (event._screen_x - self.grabbed.x)
                     * (virtual_size / self.window_size)
                 )
-            self.post_message(ScrollTo(x=x, y=y))
+            self.post_message(
+                ScrollTo(x=x, y=y, animate=not self.app.supports_smooth_scrolling)
+            )
         event.stop()
 
     async def _on_click(self, event: events.Click) -> None: