4.9.1

MAJOR: added automatic sizing code for the non-core TMP components (Dropdown, Slider, etc) so they now autosize without you having to specify their sizes
IMPROVED: auto sizing of TextMeshPro in general (using a different API call from TMP)
IMPROVED: auto preserve aspect-ratio of Image/RawImage when used in UI
FIXED: location of settings-file within the scene
FIXED: some missing attributes in the CSS/HTML Export
REMOVED: ancient layout-algorithms (v4.4.0 and earlier - the modern ones (v4.5.0+) are better in every respect)

4.7.3

FIXED: discovered an edge case where percentage-paddings of parents on the right/bottom edge were sized incorrectly; update your RootFlexContainers to use LayoutAlgorithm4.7.3 or later to get the patch

4.7.2

ADDED: more workarounds for bugs in Unity 2023

4.7.1

ADDED: Workarounds for bugs in Unity 2023 (not officially supported, since 2023 is still in beta from Unity, but this makes the latest builds of Unity-2023 work correctly)

4.7.0

ADDED: "align-content" is auto-hidden in UI when Flexbox is ignoring the value (i.e. when FlexWrap = NO_WRAP)
FIXED: margins of items (not containers!) in cross-axis direction would sometimes grow the item to be wider than its parent, when stretching
FIXED: aspect ratios were being checked for FlexContainers - which by definition should NOT have them
ADDED: aspect-ratios (especially: Sprite/Image/Texture) are more intelligently used to preserve aspect ratio by default correctly during layout
FIXED: added null check to prevent error messages when you have a UIImage with null sprite
ADDED: algorithm v4.7.0 - has extra logic to handle the final phase of layout after a parent has been grown/shrunk, especially impacts objects that are newly instantiated/cloned
FIXED: issue from C# compiler that it despatches to wrong method
FIXED: FlexContainers were resetting their position immeditely after being added via the API call
FIXED: removed hardcoded references to Algorithm-4.5, will now work with future (unreleased) algs correctly
ADDED: detailed OnTransformChanged callback debugging toggles to trace bugs in UnityEditor2022+
ADDED: corrected undoblock
FIXED: bug in IProvidesContentSize where it had multiple copies of class embedded in different ContentSizeCalculator subclasses
ADDED: Buttons that have only an image and no text now autosize (with correct aspect ratio) to the image/icon being used as the button-image
ADDED: workarounds for TextMeshPro bugs in sizing (partial: more finessing needed on the ExperimentalDelayUpdates2 which is now a messy class)
ADDED: re-added support for custom ContentSize sub-calculators, ADDED: refactored text auto-sizing and made the core methods public so 3rd party scripts can use them

4.6.0

ADDED: requested on Discord: support for CSS3-gap (column gaps and row gaps); requires your RootFlexContainer to be using a 4.6.0+ layout algorithm
FIXED: over-sensitive Warning when selecting ScrollRects inside a Flexbox hierarchy (no change in behaviour, just made it more intelligent about guessing whether to warn you or not)

4.5.0

MAJOR: huge performance increases especially when using “ExperimentalDelayUpdates2”
ADDED: made Templates hide/showable
ADDED: made Margins/Padding preview hide/showable
ADDED: tidied-up the FlexItem Inspector, made the ‘workarounds for Unity TextMeshPro bugs’ section auto-hide when not needed

4.4.2:

ADDED: greatly increased performance when entering/exiting Play mode in the Editor for scenes with large/complex UI
FIXED: Gizmos auto-fixer didn’t work in Unity2022.*
FIXED: Samples projects prevent Unity building Player builds

4.4.1:

FIXED: ---- MAJOR ---- some edge-cases in the 4.4.0 Layout Algorithm that were making items expand outside their parent, and overflow
FIXED: setting “grow” or “shrink” in Editor doesn’t update the value in scene until you click somewhere else
ADDED: Templates now automatically preserve the original parent's settings UNLESS they are adding the first child; added some warnings on console when settings need to be changed manually
ADDED: clearer UI for the FlexItem presets buttons
ADDED: extra links to useful docs in the "Help..." links on each FlexItem/FlexContainer

4.4.0:

ADDED: ---- MAJOR ---- now includes the core set of UI Templates from FlexBuilder Pro
ADDED: hot-swappable, customizable, modular GizmoRenderers: customize how your Flexbox try is visualised in the UnityEditor (PRO version ships with additional, more complex/powerful GizmoRenderers; LITE version ships with simplified GizmoRenderers)
ADDED: ExperimentalDelayUpdates2

Typically: 10x-100x speedup in complex UIs

ADDED: content-sizer 4.3.1 uses a custom replacement for Unity’s extremely slow badly written GetComponentsInChildren that runs typically 20x faster while returning the same results
ADDED: FlexContainer.Clear() - efficiently destroys all child FlexContainers and FlexItems, with near-zero GCalloc’s, greatly increasing performance when used every frame

Typically: 100x speedup in places where it’s being used

ADDED: TMP.SetFlexText() / UI.Text.SetFlexText() - these methods set the “.text” string for a Text/TMP item, but then also automatically trigger the required FlexBuilder relayout call(s)
ADDED: auto error-detection for ProjectSettings
ADDED: RFCs now auto-check the ProjectSettings for potential errors
ADDED: vertical scrollviews can now optionally auto-align their content to the bottom of the viewport when the content is shorter than the available space (not included in docs yet, experimental implementation - please check on Discord for latest info on how to enable this)
FIXED: content-sizer 4.3.1 fixes 'Text elements were ignoring their margins when being sized-to-content inside constrained spaces'
ADDED: special workaround for Unity 2020’s Editor bugs that prevent 1-click assigning of assets in the inspector
ADDED: more intelligent/richer Undo support for auto-fixes
FIXED: bug where text sometimes miscounted line heights by one line due to single-pixel error,
FIXED: align-content edge-cases in some wrapped multline layouts

4.3.0:

FIXED: over-aggressive auto-refresh in Unity2020+ generating multiple calls when potential resize event detected (reducing performance on large UIs)
FIXED: 'auto expand to fill' button was suppressing auto-relayout for the grandchild items, causing new Buttons to have almost the correct size, but not quite, until the next full-tree-layout triggered
ADDED: “public void OnContentSizeChanged()” to FlexItem instances
ADDED: support for Unity-2022

4.2.0:

ADDED: auto-detector for when you forget to add a FlexItem to a child of a FlexContainer
FIXED: when a prefab is used in the scene, it was showing “automatic checks and warnings disabled” and pausing auto-relayout
FIXED: when multi-editing multiple FlexItem GameObjects, setting a value for ‘padding’ updated all the selected objects, but the layout only changed for the last-selected-item, instead of all of them
FIXED: editing a prefab of a FlexItem or FlexContainer didn’t auto-updates/relayout other prefab-instances in the scene when you exit the PrefabStage/Editor

4.1.0:

FIXED: “NullReferenceException: Object reference not set to an instance of an object”
FIXED: small/narrow buttons never shrink below width = 160px
FIXED: TextMeshPro sizes were being cached too aggressively, causing it to look like Text/TMP wasn’t being “auto-sized” (it was re-using the initial value for too long, instead of re-calculating)
FIXED: removed all calls to UIToolkit’s broken/buggy “Clear()” method, by re-designing the refresh/repaint code
FIXED: Unity-2021 bug where the ‘grow’ and ‘shrink’ fields appear compressed to almost zero width
IMPROVED: Custom inspectors now have intelligent collapse/resize behaviour, making best use of space both when wide and narrow
IMPROVED: modularised the FlexItem inspector, so it can be upgraded in pieces (ADVANCED: and you can add your own custom inspector-modules if needed)

1.0.1:

added workaround for a Unity Text bug that causes errors to appear in console

First release: upgrades/replaces the legacy asset "Flexbox4Unity" version 3.x

FlexBuilder 2023 (Flexbox/CSS-3 UI)