26.1.2 - 1.3.0

Rule Editor

• Added client.config.RuleFormat — how a config line maps to the fields of a RuleType. RuleFormat.PIPE is the previous positional format; mods can now edit other syntaxes (prefixes, key=value pairs, lines saved in an older layout) and provide their own cross-field checks and row summaries.
• Added the field kinds BLOCK, CUSTOM (a picker whose options the mod provides by Field.source()), CHOICE and TOGGLE (buttons instead of text inputs).
• Added client.config.RegistrySuggestionSource — a RuleSuggestionSource backed by RegistryCandidates, which mods extend for their CUSTOM fields.
• RuleListScreen can take an EntryPicker to add several entries at once next to the Add button.
• RuleListScreen.withDefaults adds a Reset button.
• RuleSuggestionSource.Option can have an icon, shown in the suggestion list.
• RuleEditScreen rows now shrink on short screens so rules with many fields stay above the error line and buttons.
• Long explanations under the screen titles are cut off with the full text on hover instead of running off the screen.
• Fixed a crash in RuleType.validate when a min/max field pair was optional and left empty, and ATTRIBUTE_VALUE fields assuming the attribute is the line's second field.

Breaking Changes

• RuleSuggestionSource now takes the RuleType.Field (and the line's current values where they matter) instead of a Kind and a context string.

26.1.2 - 1.2.1

Fixes

• Added ConfigHelper.getOrDefault/ConfigHolder.getOrDefault — a guard that returns a fallback instead of throwing IllegalStateException when a config value is read before its spec is loaded (e.g. datagen or other contexts where no config file is ever loaded, such as a block's isEnabled(FeatureFlagSet) check running under the loot table provider).

26.1.2 - 1.2.0

New Utilities

• Added util.ModCompat.isLoaded(String modId) — a one-line check for whether another mod is loaded, replacing hand-rolled per-mod loader enums.
• Added util.RomanNumeralUtil.generate(int) — converts an int to a Roman numeral string.

New Client Rendering Helpers

• Added client.util.PoseStackHelper.translateAndScale/rotateItem — common PoseStack transforms for drawing an ItemStack at an offset inside a block entity renderer.
• Added client.util.RenderingUtils.swing/flap/bob/walk — limb-animation math for ModelParts.

New Config/GUI Helpers

• Added client.config.RegistryCandidates — turns a built-in or datapack registry (entities, items, blocks, attributes, enchantments, biomes) into a searchable candidate list for EntryPickerScreen, including a fallback for datapack-driven registries (biomes, enchantments) when no world is loaded, e.g. editing config from the title screen.
• Added a second, heavier config-list editor for pipe-delimited, multi-field config rows: client.config.RuleType (field schema with per-field validation), RuleSuggestionSource (caller-supplied id lookups), RuleListContext (translation key prefixes), RuleListScreen and RuleEditScreen. This complements the existing append-only PickerListScreen for config lists that need several validated fields per row, edited in place.

Internal Cleanup

• No breaking changes to existing public APIs.