FIX: InputSystem warnings displayed with Unity editor 6000.6 version

[josepmariapujol-unity]

Description

InputSystem warnings displayed with Unity editor 6000.6 version.

Warnings:

Testing status & QA

Please describe the testing already done by you and what testing you request/recommend QA to execute. If you used or created any testing project please link them here too for QA.

Overall Product Risks

Please rate the potential complexity and halo effect from low to high for the reviewers. Note down potential risks to specific Editor branches if any.

• Complexity: 1
• Halo Effect: 1

Comments to reviewers

Please describe any additional information such as what to focus on, or historical info for the reviewers.

Checklist

Before review:

• Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

[u-pr]

This pull request introduces several critical serialization issues. Multiple fields marked with [NonSerialized] are essential for preserving input device state, layout matching, and editor window persistence. While some changes provide performance optimizations and valid cleanups, the serialization regressions require immediate attention.

_{🤖 Helpful? 👍/👎}

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@             Coverage Diff             @@
##           develop    #2379      +/-   ##
===========================================
- Coverage    77.90%   77.89%   -0.01%     
===========================================
  Files          476      481       +5     
  Lines        97613    97691      +78     
===========================================
+ Hits         76048    76100      +52     
- Misses       21565    21591      +26     

Flag	Coverage Δ
inputsystem_MacOS_2022.3	5.50% <ø> (-0.03%)	⬇️
inputsystem_MacOS_2022.3_project	75.40% <100.00%> (+<0.01%)	⬆️
inputsystem_MacOS_6000.0	5.28% <ø> (-0.03%)	⬇️
inputsystem_MacOS_6000.0_project	77.30% <100.00%> (+0.01%)	⬆️
inputsystem_MacOS_6000.3	5.28% <ø> (-0.03%)	⬇️
inputsystem_MacOS_6000.3_project	77.30% <100.00%> (+0.01%)	⬆️
inputsystem_MacOS_6000.4	5.28% <ø> (-0.03%)	⬇️
inputsystem_MacOS_6000.4_project	77.31% <100.00%> (+0.01%)	⬆️
inputsystem_MacOS_6000.5	5.28% <ø> (-0.03%)	⬇️
inputsystem_MacOS_6000.5_project	77.31% <100.00%> (+<0.01%)	⬆️
inputsystem_MacOS_6000.6	5.28% <ø> (-0.03%)	⬇️
inputsystem_MacOS_6000.6_project	77.31% <100.00%> (+<0.01%)	⬆️
inputsystem_Ubuntu_2022.3_project	75.20% <100.00%> (+<0.01%)	⬆️
inputsystem_Ubuntu_6000.0_project	77.11% <100.00%> (+0.01%)	⬆️
inputsystem_Ubuntu_6000.3_project	77.11% <100.00%> (+<0.01%)	⬆️
inputsystem_Ubuntu_6000.4_project	77.12% <100.00%> (+<0.01%)	⬆️
inputsystem_Ubuntu_6000.5_project	77.12% <100.00%> (+<0.01%)	⬆️
inputsystem_Ubuntu_6000.6_project	77.12% <100.00%> (+0.01%)	⬆️
inputsystem_Windows_2022.3_project	75.53% <100.00%> (+<0.01%)	⬆️
inputsystem_Windows_6000.0_project	77.43% <100.00%> (+<0.01%)	⬆️
inputsystem_Windows_6000.3_project	77.43% <100.00%> (+<0.01%)	⬆️
inputsystem_Windows_6000.4_project	77.43% <100.00%> (+<0.01%)	⬆️
inputsystem_Windows_6000.5_project	77.44% <100.00%> (+0.01%)	⬆️
inputsystem_Windows_6000.6_project	77.43% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...utSystem.Editor/InputActionReferenceEditorTests.cs	97.61% <100.00%> (ø)
Assets/Tests/InputSystem/Plugins/UITests.cs	94.67% <100.00%> (ø)
...utsystem/InputSystem/Devices/InputDeviceMatcher.cs	62.54% <ø> (ø)
...system/InputSystem/Devices/Remote/InputRemoting.cs	81.32% <ø> (ø)
...em/InputSystem/Editor/Internal/InputStateWindow.cs	0.00% <ø> (ø)
...Editor/UITKAssetEditor/InputActionsEditorWindow.cs	52.85% <ø> (-1.81%)	⬇️
....inputsystem/InputSystem/Events/InputEventTrace.cs	84.61% <ø> (ø)
.../com.unity.inputsystem/InputSystem/InputManager.cs	91.74% <ø> (-0.03%)	⬇️

... and 6 files with indirect coverage changes

[u-pr]

No new unique findings were identified in this review pass. All critical issues regarding serialization risks, state persistence across domain reloads, and performance optimizations have already been documented in the existing comments.

_{🤖 Helpful? 👍/👎}

[jfreire-unity]

Wait, we might need to look into this , pinging you locally.

[josepmariapujol-unity]

#2380