Merge pull request #4100 from TomJGooding/fix-option-list-add-max-height-to-fix-scrolling

fix(option list): add max height to fix scrolling

Author: willmcgugan

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fixed scrolling in long `OptionList` by adding max height of 100% https://github.com/Textualize/textual/issues/4021
 - Fixed `DirectoryTree.clear_node` not clearing the node specified https://github.com/Textualize/textual/issues/4122
 
 ### Changed
@@ -29,6 +30,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added Worker.cancelled_event https://github.com/Textualize/textual/pull/4075
 - `Tree` (and `DirectoryTree`) grew an attribute `lock` that can be used for synchronization across coroutines https://github.com/Textualize/textual/issues/4056
 
+
 ## [0.48.2] - 2024-02-02
 
 ### Fixed

src/textual/widgets/_option_list.py

@@ -177,6 +177,7 @@ class OptionList(ScrollView, can_focus=True):
     DEFAULT_CSS = """
     OptionList {
         height: auto;
+        max-height: 100%;
         background: $boost;
         color: $text;
         overflow-x: hidden;