added doc

Author: bmalrat

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -30,13 +30,17 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed tooltip support in the UI Toolkit version of the Input Actions Asset editor.
 - Fixed documentation to clarify bindings with modifiers `overrideModifiersNeedToBePressedFirst` configuration [ISXB-806](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-806).
 - Fixed an issue in `Samples/Visualizers/GamepadVisualizer.unity` sample where the visualization wouldn't handle device disconnects or current device changes properly (ISXB-1243).
+- Fixed an issue when displaying Serialized InputAction's Processor properties inside the Inspector window. [ISXB-1269](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1269)
 
 ### Changed
 - Added back the InputManager to InputSystem project-wide asset migration code with performance improvement (ISX-2086).
 - Changed `OnScreenControl` to automaticaly switch, in Single Player with autoswitch enabled, to the target device control scheme when the first component is enabled to prevent bad interactions when it start.
 - Changed paremeter `overrideModifiersNeedToBePressedFirst` to obsolete for `ButtonWithOneModifier`, `ButtonWithTwoModifiers`, `OneModifierComposite` and `TwoModifiersComposite` in favour the new `modifiersOrder` parameter which is more explicit.
 - Changed `Samples/Visualizers/GamepadVisualizer.unity` to visualize the control values of the current device instead of the first device.
 
+### Added
+- Added new API `InputSystem.settings.useIMGUIEditorForAssets` that should be used in custom `InputParameterEditor` that use both IMGUI and UI Toolkit.
+
 ## [1.11.2] - 2024-10-16
 
 ### Fixed

Packages/com.unity.inputsystem/InputSystem/InputSettings.cs

@@ -979,7 +979,14 @@ public enum InputActionPropertyDrawerMode
         }
 
 #if UNITY_EDITOR && UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
-        public bool useIMGUIEditorForAssets => UnityEditor.EditorGUI.indentLevel >0 || IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets);
+        /// <summary>
+        /// Determines if we should render the UI with IMGUI even if an UI Toolkit UI is available.
+        /// 
+        /// This should be used when writing a custom <see cref="InputParameterEditor"/> to :
+        /// * support inspector view which only work in IMGUI for now.
+        /// * prevent the UI to be rendered in IMGUI and UI Toolkit in the Input Actions Editor window.
+        /// </summary>
+        public bool useIMGUIEditorForAssets => UnityEditor.EditorGUI.indentLevel > 0 || IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets);
 #endif
 
         private static bool CompareFloats(float a, float b)