FIX: Extra empty lines added in the control bindings drop-down for some mouse buttons (#2299)

Co-authored-by: Paulius Dervinis <pauliusd@unity3d.com>

Author: K-Tone

Assets/Tests/InputSystem.Editor/UGUITests.cs

@@ -1,4 +1,4 @@
-#if UNITY_EDITOR && UNITY_6000_0_OR_NEWER
+#if UNITY_EDITOR && UNITY_6000_0_OR_NEWER && UNITY_INPUT_SYSTEM_ENABLE_UI
 using System;
 using NUnit.Framework;
 using UnityEditor;

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -13,6 +13,7 @@ however, it has to be formatted properly to pass verification tests.
 ### Fixed
 
 - Fixed warnings being generated on Unity 6.4 and 6.5. (ISX-2395).
+- Fixed extra empty lines being displayed in the control binding list when mouse buttons are pressed [ISXB-1677](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1677)
 
 ## [1.17.0] - 2025-11-25
 

Packages/com.unity.inputsystem/InputSystem/Editor/Internal/AdvancedDropdown/AdvancedDropdownDataSource.cs

@@ -118,7 +118,7 @@ private void BuildSearchableElements(AdvancedDropdownItem item)
         {
             if (!item.children.Any())
             {
-                if (!item.IsSeparator())
+                if (!item.IsSeparator() && item.searchableName.Length > 0)
                     m_SearchableElements.Add(item);
                 return;
             }