What's Changed

• Play subtags + repeats by default. Now playback options are accessible through Frame > Playback submenu
• Added pixel-art Cyrillic script and Maltenese Unicode chars #3699 t/4078 t/1851
• Added ability to press a mnemonic key (e.g. Y or N) without modifiers in alerts
• Added frame duration warnings saving animated GIF files #1504
• Allow recovering sessions from previous Aseprite versions #3727
• Fixed regression pasting images outside the canvas limits #3725
• Fixed rotation inaccuracy with 90°, 180° or 270° degrees #3041
• Fixed 8 Connected Fill escapes grid with "Stop At Grid" checked #3564
• Now New Palette from Sprite creates colors when alpha is less than 16 #3715
• Removed the marching ants effect from Timeline after paste t/3941 t/5038 t/17281
• Fixed avoid changing grid settings from Edit > Preferences if they aren't modified #3479
• Fixed grid misalignment when zooming out #3638 t/16566
• Fixed a rendering bug using Loop through tag frames option in Onion Skin #3739
• Fixed crash right-clicking play button if the preview window is hidden
• CLI: Fixed bug saving tags in file sequences using -save-as "{tag}_1.png" t/17253
• Lua: New Plugin:newMenuGroup() and Plugin:newMenuSeparator() to organize plugin submenus #3731
• Lua: Added KeyEvent.repeatCount api#95
• Lua: New opacity/blend mode parameters in Image:drawImage()
• Lua: More changes
• Several other crash fixes and minor UI issues

https://community.aseprite.org/t/aseprite-v1-3-rc2/17564

Full Changelog: https://github.com/aseprite/aseprite/compare/v1.3-rc1...v1.3-rc2