FIX: Input Actions Editor toolbar buttons no longer overlap [ISXB-1783] (#2374)

Author: K-Tone

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed caching for InputControlPath display name [ISX-2501](https://jira.unity3d.com/browse/ISX-2501)
 - Fixed editor closing and not saving the input asset when clicking cancel in the dialog prompt [UUM-134748](https://jira.unity3d.com/browse/UUM-134748)
 - Fixed the input actions editor window entering a corrupt state when restarting Unity after the asset was edited. [UUM-134737](https://jira.unity3d.com/browse/UUM-134737)
+- Fixed the Input Actions Editor Window toolbar buttons overlapping each other when the window size is too small [ISXB-1783] (https://jira.unity3d.com/browse/ISXB-1783)
 - Fixed `buttonSouth` returning the state of the east button (and so on for all the compass named buttons) when using a Nintendo Switch Pro Controller on iOS [ISXB-1632](issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1632)
 - Fixed `aButton` returning the state of the east button (and so on for all the letter named buttons) when using a Nintendo Switch Pro Controller on Standalone & iOS [ISXB-1632](issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1632)
 - Fixed an issue where `UIToolkit` `ClickEvent` could be fired on Android after device rotation due to inactive touch state being replayed during action initial state checks [UUM-100125](https://jira.unity3d.com/browse/UUM-100125).

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/PackageResources/InputActionsEditorStyles.uss

@@ -229,3 +229,7 @@
 .matching-controls-labels {
     margin: 1px;
 }
+
+#action-editor {
+    min-width: 520px;
+}