Aseprite v1.3.18 Released

Aseprite v1.3.18 is a substantial point release rather than a simple bug-fix drop. The biggest practical win is faster undo/redo, which now keeps doc::Objects in memory to reduce churn during editing. On top of that, the editor UI gets a preferences search, a new tooltip manager with preference-based delays, widget consistency cleanup, and timeline improvements for layer groups.

The release also expands automation and pipeline support. The CLI can now try to install extensions, and it adds a power-of-two sheet size flag plus the corresponding UI. Lua users get a new eyedropper action for useTool, better dialog label/buddy handling, and broader transaction-name translation work. Extension testing was improved too, including support for custom formats with saving and loading.

Several fixes target correctness and stability in common workflows: eyedropper behavior without a reference layer, hidden layers affecting z-index, tile selection in tilemap layers, zoom distortion at 20%, and a crash when undoing transactions involving MovingPixels. There are also fixes for native file dialog behavior on macOS, Preferences search crashes, pasted-selection deletion crashes, and a RunCommand matching regression.

For teams using Aseprite in production, this release is mostly about smoother iteration and fewer editor surprises. The move of the .aseprite encoder to the dio library and the refactors for new layer types suggest ongoing internal cleanup that should help future feature work, while the new CLI and scripting hooks make the tool a bit more automation-friendly for build and...