Wesnoth 1.19.4

Lua API

• Added new function gui.switch_theme() to allow switching to another gui2 theme from inside a scenario.
• Updated to lua 5.4.7

Translations

• Updated translations: Arabic, Bengali, British English, Chinese (Simplified), Czech, Italian, Japanese, Turkish, Ukrainian

Units

• Walking Corpse: arcane vulnerability reduced from 40% to 20%.
• Soulless: arcane vulnerability reduced from 40% to 20%.

User interface

• GUI2 themes can be loaded from add-ons. Requires a `gui-theme.cfg` file in add-on root with a `` tag that acts as the entry point for the theme.
• Option key is now identified as such instead of Alt in the Hotkeys preferences section on macOS builds
• Search filter should now be case-insensitive for more than just ASCII characters (#9328)
• Whirlpools no longer get submerged in water.
• The in-game chat now properly redraws over water and other animated terrain.
• Fixed items not appearing properly when submerged.

WML Engine

• Removed properties `unit.side` and `terrain.owner` from WFL. Use `unit.side_number` and `terrain.owner_side` instead.
• Fixed events with negative priority not being stored in save files.
• Events can now be added to abilities and weapon specials.