AI:

• Experimental AI:[list]
• Spread poison: bug fix for units ignoring [avoid] tag
• Castle switch: bug fix for units-on-keep check
• Remove village hunt CA
• Add ids for candidate actions
  

• Fix bug crashing some AIs when units with chance-to-hit specials without id are on map
• Fast Micro AI: fix re-adding default CAs when deleting the MAI
• Bottleneck Defense Micro AI: fix bug of units not participating if too far in front of the bottleneck
• Lua AIs: several other minor behind-the-scenes bug fixes
  

Campaigns

• Descent into Darkness:[list]
• S1: reduced difficulty
  

• Heir to the Throne:[list]
• Modify campaign starting date
  

• Legend of Wesmere:[list]
• Fix various date inconsistencies in historical references
  

• Sceptre of Fire:[list]
• S1: Fix reference to LoW events
  

• The South Guard:[list]
• Change Halidel to be Deoran's great-grandfather
• S7b/S8b: reduce enemy gold values and modify dialogue upon allied unit death
  

• Tutorial:[list]
• S2: Make the first grunt cross the bridge, otherwise the scenario is too hard
  

• Under the Burning Suns:[list]
• Sun Singer and Sun Sylph: modify faerie fire colors
  

Language and i18n

• Updated translations: British English, Chinese (Simplified), Chinese (Traditional), Czech, Dutch, Esperanto, French, German, Italian, Korean, Portuguese (Brazil), Russian, Spanish, Turkish
• Fix Rename Unit dialog having untranslated text (issue #4569).
  

Lua API

• wesnoth.deprecate_api was fixed to correctly wrap tables with metatables (issue #4079).
  

Music and sound effects

• Removed accidental silence of two seconds after the first track of each scenario (issue #4459).
  

Units

• Add various new death, standing, and idle animations
  

User interface

• Fixed some severe game rendering issues with SDL 2.0.10 (issue #4237, issue #4245, issue #4510).
• Draw ellipses during draw/sheath animations (issue #1527).
• In the combat dialog and elsewhere, clicking the "Profile" button opens the help on the correct unit variation (e.g., Walking Corpse (Swimmer)) (issue #4142).
• Ensure enough space to display turn numbers in the hundreds.
• The search box in the Campaigns menu now takes campaign abbreviations and descriptions into account.
• Added the Private Replay checkbox to the Multiplayer Create Game screen. This separates whether observers are allowed from whether the replay will be publicly available.
• In the recruit dialog and recall dialog, units that are too expensive to recruit/recall are grayed out (PR #4362, PR #4444, part of issue #1282).
• Reworked styling of progress bars and the network transfer progress dialog.
• Removed "Classic" in-game theme.
• Textboxes now have a hover effect as well as an I-beam cursor.
  

Packaging

• The Wesnoth client now looks for the data/dist file when logging into the multiplayer server. This file should contain one of the following values based on what distribution channel the package is for: Default, Steam, SourceForge, Flatpak, macOS App Store, Linux repository, iOS, Android, BSD repository
  

Miscellaneous and bug fixes

• New build-dependency: Python3 is required to run the WML unit tests (on non-Windows)
• 80% of WML unit tests now run in a batch using a single instance of Wesnoth (non-Windows only)
• New help topic outlining common (and less common) reasons for losing a scenario (PR #4217).
• Add help text for some debug commands (part of issue #2500).
• Make wmllint recognize `[load_resource]` (issue #4538).
• Make wesnoth_addon_manager not generate packet.dump files any more (issue #4651)