Unity 6.6 support - fix SetLayoutInputForAxis argument order

[RunoLight]

Unity UI Extensions - Pull Request

Replaces #536. That PR was opened against release and, after it was retargeted to development, could not merge: the branch also carried release-only commits (README, workflows, version bump) and conflicted with development.

This branch is development plus the Unity 6.6 layout fix only.

Overview

LayoutGroup.SetLayoutInputForAxis on Unity 6.6+ is (totalMin, totalMax, totalPreferred, totalFlexible, axis). The calls added in #530 appended an extra argument, so preferred, flexible, and axis were shifted. FlowLayoutGroup and TableLayoutGroup now pass totalMax in the second slot and keep the previous preferred and flexible values.

The other Unity 6.5 / 6.6 updates from #536 (GetEntityId, maxWidth / maxHeight, useLegacyMeshGeneration) are already on development.

Changes

• FlowLayoutGroup: unlimited max via LayoutUtility.DefaultMaxSize, previous preferred and flexible values unchanged.

• TableLayoutGroup: fixed column width uses max == preferred; flexible rows use an unconstrained max.

• Older Unity versions still use the 4-argument overload under #if UNITY_6000_6_OR_NEWER.

• Fixes: BUG: Object.GetInstanceID()' is obsolete for 6000.5.6f1 #532

• Fixes: BUG: Compilation problems for classes implementing ILayoutElement in 6000.6 #534

Breaking Changes

• No breaking changes. Older Unity versions keep the previous API through conditional compilation.

Related Submodule Changes

• N/A

Testing status

• No tests have been added.

Manual testing status

• Argument order checked against the Unity 6.6 SetLayoutInputForAxis(totalMin, totalMax, totalPreferred, totalFlexible, axis) signature.
• Compared with the calls already on development from Upversion development to 3.0.1-pre.1 [skip ci] #530, which appended a trailing argument and shifted preferred, flexible, and axis.