Add-ons client

• Added automatic schema-validation of `_server.pbl` files when uploading an add-on. (PR #7239)

Campaigns

• Legend of Wesmere
  • Adjusted gold and carryover between S11, S14 and S17. (issue #7230)
  • S03: Fixed an event trigger when Urudin retreats. (PR #7221)
  • S16: Updated screen flash to use new macros.

• Secrets of the Ancients
  • S17: Use the new `screen_fade` visual effect.

• Son of the Black Eye
  • S14: Fixed Grs dialogue not appearing during the intro. (issue #7280)

• The South Guard
  • S04: Updated safeguard against AI leader stupidity to match map changes.

• Under the Burning Suns
  • Quenoth Rework, including the major changes listed below. (PR #7349)
  • Redesign of the Quenoth Fighter line, with multiple attacks instead of the formation ability.
  • Redesign of the Quenoth Shaman line, with songs and the tailwind ability.
  • Redesign of the Tauroch Rider line, giving both Tauroch and Rider one attack each.
  • Hide XP bars for some enemies that are never expected to advance a level.

• World Conquest
  • Fix mechanic when a commander replaces a dead leader. (issue #7284)

Editor

• Scrolling the map north or south can move the text that overlays the map, so it doesnt always obscure the southmost hexes of the map. (issue #6422)

Multiplayer

• Allied units orbs no longer look like the players own units orbs. (issue #7108)
  • By default, they are now two-color during the allys turn.
  • Added an advanced setting to always show them as single-color (the ally color).

• Add waterfall animations to Isars Cross. (PR #7348)

Terrain

• Added Art Placeholder overlay (terrain code `^Xxxx`), used for Isars Cross new waterfalls. (PR #7348)

Translations

• Updated translations: British English, Chinese (Simplified), Czech, Dutch, Finnish, French, Polish, Portuguese (Brazil), Spanish
• wmlxgettext always uses Unix-style file paths in .pot files, to reduce changes when working on different platforms. (issue #7380)

Units

• Add Merman Brawler and Citizen to core.
• Add Dwarvish Miner to core.
• Add Sand Scamperer unit.
• Giant Ant now advances to Soldier Ant, requiring 26 XP.
• Soldier Ant now costs 16 gold, has 35 HP and needs 50 XP to advance.

User interface

• Added icons for invulnerable and unhealable states. (PR #7363)
• The help browser shows groups (`[race]help_taxonomy=`) in subfolders. For example Humans/Dunefolk and Elves/Quenoth. (PR #7228)

WML API

• New `attacks_used` key in `[attack]` causes the attack to deduct more than 1 from `attacks_left`. (PR #7351)
• Fixed `[foreach]` when nested loops used the same variable name for the inner and outer loop. (issue #6305)
• New `[trait]require_traits=` and `[trait]exclude_traits=` to control random trait generation. (PR #7109)

WML Engine

• Added basic achievements functionality.

Miscellaneous and Bug Fixes

• Fixed a regression in 1.17.x resulting in overlarge unit HP and XP bars in some cases. (issue #7171)
• Fixed the editors unit tool crashing when placing a unit. (issue #7296)
• Many command-line options that log to stdout/stderr now automatically imply `--no-log-to-file`. (issue #7310)
• General consolidation of code paths for logging between Windows and non-Windows platforms.
• Fixed crash and missing output in `--report`.
• Schema validation accepts variables in `[harm_unit]alignment`.
• Schema validation no longer accepts the unused `[unit]hp_bar_scaling` and `[unit]xp_bar_scaling`.
• Fix an issue with schema validator not reporting errors at top level.
• The `unit_tree` tool which generates https://units.wesnoth.org/ now ignores the `[advancefrom]` tag.
• Fix the search for the game data directory when doing a local Visual Studio build.
• Fixed warnings when compiling with Boost 1.81.