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Changelog

All notable changes to LeanTypeDual are documented here.

The format is based on Keep a Changelog, and this project uses Semantic Versioning.

Lineage & provenance. LeanTypeDual is a fork of LeanBitLab/LeanType (the AI layer), which is itself a fork of Helium314/HeliBoard (the keyboard engine), based on AOSP/OpenBoard. Rather than re-list every inherited HeliBoard/LeanType version, this changelog records LeanTypeDual's own releases. Points where upstream code was merged in are noted as Upstream markers; everything else is original to this fork.

[Unreleased]

Added

  • Source-key action targets — slide from the Enter/action key into a temporary action target panel for existing actions like JOIN_NEXT, FORCE_NEXT_SPACE, and UNDO_WORD. (#37)

[3.9.1] - 2026-06-11

Fixed

  • Erratic capitalization in two-thumb grace mode. After the grace timer auto-committed a word, the shift/auto-caps state wasn't refreshed, so the next word's capitalization came out wrong (dropped sentence caps, or mid-word capitals). (#14)

Changed

  • Tapped words no longer auto-finish by default in two-thumb grace mode — the new "Only auto-finish swiped words" option defaults on, so a word you tap out stays open until you press space or pick a suggestion (fixes tapped shortcuts/corrections firing early). Only swiped words auto-commit on a pause. (#14)
  • Reworded the two easily-confused spacing toggles: "Only auto-space after swipes" (the trailing space) vs "Only auto-finish swiped words" (whether the word commits at all). (#14)

Added

  • Experimental: defer grace-mode space (PREF_SPACING_DEFER_GRACE_SPACE, default off) — routes the two-thumb grace auto-commit space through the same deferred mechanism as the default swipe path. (#23)

[3.9.0] - 2026-06-10

Added

  • HCESAR keyboard layout for Latin-script subtypes. (#74)
  • Touchpad edge-scroll — holding a finger near the touchpad edge auto-repeats cursor movement with acceleration. (#74)
  • Toolbar: swipe down to hide the keyboard. (#74)
  • Toolbar: show only the toolbar when a hardware keyboard is connected. (#74)
  • Undo-word toolbar key — reverts the last committed word back to its suggestion alternatives. (#35)
  • Pointer-trace recorder (opt-in) — captures gesture traces + keyboard geometry to JSON for debugging/recognition work. (#20)

Changed

  • Graduated trust for newly-learned words — a just-learned word is held below real-dictionary suggestions until you've used it a few times, reducing premature autocorrect to half-typed words. (#39)
  • Two-thumb down-swipe shortcut popup now tiles its icons proportionally across the usable row. (#36)
  • README status badges switched to live shields.io badges (auto-updating; no CI). (#76)
  • Backspace bookkeeping consolidated into a single, unit-tested BackspaceUnitStack (internal refactor, behaviour-preserving). (#31)

Reliability & testing

  • Native C++ engine tests now run in CI. A standalone host build (app/src/main/jni/CMakeLists.txt) compiles and runs the dictionary/suggest/geometry gtest suite on every change to the native engine — coverage the JVM/Robolectric tests cannot reach. (#78)
  • Added a golden-master backspace regression corpus to the JVM suite, and the unit-test gate is now blocking on every PR. (#21, #12)

[3.8.6] - 2026-06

Added

  • Flag learned/typed words that aren't in a dictionary; long-press to Add or Block them, plus a new Blocklist settings screen.

Changed

  • Two-thumb: the down-swipe shortcut popup now aligns to the letter row (swiping down on a key selects the icon above it).

Fixed

  • Two-thumb ghost-merge: a deleted or cancelled gesture trail no longer fuses into the next swipe.

[3.8.5]

Added

  • Enable or disable individual dictionaries (built-in and custom) in settings.

Fixed

  • Toolbar key customization toggles not persisting.
  • Emoji-search keyboard not splitting in landscape when split keyboard is enabled.

[3.8.4]

Added

  • Double-tap touchpad gesture to delete selected words.
  • Clipboard screenshot compression toggle; duplicate screenshots prevented.
  • Text Expander: backspace-to-revert, and %cursor% / %greeting% / %tomorrow% / list placeholders (with optional custom count, e.g. %list_5%).

Changed

  • Gboard dictionary import performance; settings/editor performance, stability and memory.

Fixed

  • Missing words on import; corrupted imports (ZIP signatures pre-verified, streams closed).

[3.8.3]

Added

  • Custom "Clear clipboard" toolbar key icon styles (bin, sweep, slanted, legacy).
  • Custom drawable picker highlights in the Customize Icons grid; instant icon updates without restart; quick clipboard-item clear on long-press.

Fixed

  • Swipe-to-delete clipboard crash; pinned-section styling.
  • Double-space-period countdown cancellation on Korean & combiner layouts.

[3.8.2]

Added

  • Text Expander with placeholders (%clipboard%, %day%, %time12%, …) and a guide.
  • Customizable tags for Custom AI Keys (themed capsules).
  • Option to fold pinned clipboard items by default.
  • Redesigned Sponsor dialog.

Fixed

  • F-Droid reproducible-build packaging discrepancy.
  • Large clipboard-text truncation (native paste); clipboard suggestion in split-toolbar mode.

[3.8.1]

Added

  • Fine-grained vibration strength (amplitude) control for keypress haptics.
  • "Clear All" + confirmation in the personal-dictionary settings screen.

Fixed

  • Resources$NotFoundException crash from obsolete custom-icon overrides.
  • Spacebar cursor-move and delete swipe in the emoji-search input field.
  • Center-crop scaling for custom keyboard background images (no more squishing).

Baseline

Upstream — Forked from LeanBitLab/LeanType (AI proofreading/translation, floating keyboard, custom AI keys) on top of HeliBoard 3.8.x (the keyboard engine: dictionaries, layouts, multilingual typing, glide typing, clipboard history, themes). LeanTypeDual ships as a distinct app (com.asafmah.leantypedual) and adds, on top of that base, two-thumb (dual-thumb) typing and the per-release changes above. See the README for the full feature set.