release: prep v2.0.0 (changelog, OXCE-compat split, nameless nightlies)

.github/workflows/ci-main.yml

@@ -364,7 +364,7 @@ jobs:
           body_path: ${{ needs.meta.outputs.channel == 'release' && 'release-notes.md' || '' }}
           generate_release_notes: ${{ needs.meta.outputs.channel != 'release' }}
 
-      - name: Strip auto-generated 'New Contributors' from nightly notes
+      - name: Strip 'New Contributors' + author handles from nightly notes
         if: needs.meta.outputs.channel == 'nightly'
         shell: pwsh
         env:
@@ -379,10 +379,13 @@ jobs:
           # the regex below never match. Always -join "`n" first.
           $body  = (gh release view nightly --repo "$env:GITHUB_REPOSITORY" --json body --jq '.body') -join "`n"
           $clean = [regex]::Replace($body, "(?s)\r?\n?## New Contributors\r?\n(?:\*.*\r?\n?)*\r?\n?(?=\*\*Full Changelog\*\*)", "`n`n")
+          # Drop the "by @author" credit from each "What's Changed" bullet - the notes
+          # should describe the change, not the committer.
+          $clean = [regex]::Replace($clean, ' by @[A-Za-z0-9-]+ in (https://\S+)', ' in $1')
           Set-Content nightly-notes.md $clean -Encoding utf8
           if ($clean -notmatch "## What's Changed") { throw "nightly notes look wrong after strip - aborting rather than publishing mangled notes" }
           gh release edit nightly --repo "$env:GITHUB_REPOSITORY" --notes-file nightly-notes.md
-          Write-Host "Stripped 'New Contributors' from nightly notes"
+          Write-Host "Stripped 'New Contributors' + author handles from nightly notes"
 
   # 32-bit static WinXP binary, MinGW cross-compiled on Linux via MXE. Shares no
   # artifact with the x64 build, so it starts as soon as `meta` has the version and

CHANGELOG.md

@@ -10,23 +10,100 @@ Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/). Newest first.
 ## [Unreleased]
 - Notes for the next release accumulate here; rename to `## [x.y.z]` when tagging.
 
-### Fixed
-- Co-op transfers: fixed a use-after-free when transferring a craft with crew to
-  a co-op base — kept crew are now unassigned before the craft is freed, so their
-  craft pointer is never left dangling (could crash or corrupt saves).
-- Co-op transfers: the receiver now validates that the target base exists before
-  acknowledging a transfer/purchase, so the sender no longer removes goods (or
-  deducts funds) for a transfer that can never be applied (silent item loss).
-- Co-op transfers: restored the peer notification dropped in the purchase-sync
-  rework — an immediate soldier/equipment transfer to a co-op base again arrives
-  at the receiving base (fixes gear not moving with a transferred soldier).
-
-<!--
-## [8.4.3] - 2026-07-15
+<!-- Template for the next release section (keep this comment ABOVE the newest
+     released section: the notes extractor reads from "## [<v>]" until the next
+     line starting with "## ", so a commented heading below a real section would
+     leak a dangling "<!-" into the release body):
+## [2.0.1] - 2026-XX-XX
 ### Added
 - ...
 ### Fixed
 - ...
 ### Changed
 - ...
 -->
+
+## [2.0.0] - 2026-07-28
+
+The first official release since v1.8.4, and the biggest update the mod has
+had: a brand-new SHARED campaign mode, host-authoritative saving, an automatic
+save upgrader, in-game voting, and a long list of desync, crash and item-loss
+fixes. Windows x64, Windows XP (32-bit) and Linux packages now ship together
+with every release.
+
+### Added
+- **SHARED co-op campaign** — a second co-op mode where both players run one
+  world together: shared bases, funds, research, manufacturing and craft.
+  Either player can command any craft, fly interceptions and dogfights, and a
+  battle can mix soldiers from both players in a single squad. The campaign
+  type is chosen at NEW GAME (Solo / Co-op (Separate) / Co-op (Shared)).
+  Includes a periodic desync checksum with automatic repair, live economy
+  refresh, and a landing broker so simultaneous craft arrivals stay ordered.
+- **Save upgrader** — saves from older versions (including legacy v1.8.4 co-op
+  saves) are detected on load and upgraded in-game, step by step, to the
+  current format; mid-battle saves are supported. Solo saves are never
+  touched.
+- **Host-authoritative saving** — the host's save now embeds the client's
+  world, making it the single authority for both players' campaigns; clients
+  resume straight from the host's copy, so there is no more guessing which
+  machine has the "right" save.
+- **Multiplayer voting** — in-game vote dialogs (for example, voting to abort
+  a battle), with matching lobby improvements.
+- **Clipboard paste** — text fields accept paste (Ctrl+V) on Windows, Linux
+  and macOS.
+- **Skirmish co-op lobby** — NEW BATTLE co-op is redesigned around a
+  host-driven lobby with a BATTLE SETTINGS screen and a join popup shown over
+  the lobby; battles in progress can be rejoined.
+- **Soldier gifting and transfers** — gift soldiers to the other player
+  (optionally with their gear), including a reworked in-battle gifting flow,
+  and transfer soldiers between players with rollback if the receiver cannot
+  take them.
+- **Server browser** — the server list can aggregate multiple rendezvous
+  servers.
+- **Geoscape ally indicator** — your partner's craft and bases are marked on
+  the globe.
+- **Off-turn scanner indicators** in battle while it is not your turn.
+- **Crash reporting** — crash logs are actionable and minidumps are written
+  next to them.
+- Text labels in the Add Server menu and a Hotseat tooltip in the Host menu.
+
+### Changed
+- The neutral side in battle is reported as "Outsiders Activity" instead of
+  "Alien Activity".
+- The main menu shows a readable version block (coop version plus the OXCE
+  engine version), and official releases drop the channel suffix.
+- Equipment stored at the other player's bases is hidden from your own
+  equip screens.
+- Release packaging: the Windows x64, Windows XP i686 and Linux x86_64
+  packages are built, tested and published together, and every package now
+  includes the co-op art, a working official-server `rendezvous.json` and
+  `LICENSE.txt`.
+
+### Fixed
+- Geoscape sync no longer floods the connection: position updates ride a
+  last-write-wins lane, packet queues are thread-safe, and the "TX queue
+  full" / multi-second-ping stalls are gone.
+- Purchases and transfers between players: fixed a use-after-free when
+  transferring a craft with crew; the receiver validates the target base
+  before acknowledging, so goods are no longer silently lost; restored the
+  dropped transfer notification; a transfer can no longer be applied twice;
+  and a client's out-craft keeps its co-op destination across a host save.
+- Battlescape item sync: battles no longer lose or duplicate items across
+  machines, and a proximity-grenade blast no longer sweeps every loose item
+  off the other player's floor.
+- Mid-battle disconnects: a peer dropping mid-battle no longer freezes the
+  game (or dumps you into a lobby), the host is no longer trapped behind the
+  reconnect dialog, and "Waiting for host to resume" can no longer strand a
+  client forever.
+- Returning to the main menu tears the co-op session down cleanly, fixing
+  crashes and palette corruption after leaving a battle.
+- SHARED mode: mission sites and waypoints keep a consistent lifecycle on
+  both machines, and UFO/mission detection stays in parity.
+- SEPARATE mode: duplicate mission ids are de-duplicated at the snapshot
+  sender.
+- Chryssalid zombies no longer double-spawn in co-op battles.
+- The cursor no longer misbehaves during the other player's turn.
+- Craft status stays in sync between players.
+- Password-protected lobbies can be joined — and left — cleanly.
+- Co-op menu entry points no longer crash when no save is active.
+- Fixed a crash when unloading a weapon at a base.

src/Engine/CrossPlatform.cpp

@@ -1795,7 +1795,7 @@ std::array<int, 4> parseVersion(const std::string& newVersion)
  */
 bool isHigherThanCurrentVersion(const std::string& newVersion)
 {
-	return isHigherThanCurrentVersion(parseVersion(newVersion), { OPENXCOM_VERSION_NUMBER });
+	return isHigherThanCurrentVersion(parseVersion(newVersion), { OPENXCOM_VERSION_OXCE_NUMBER });
 }
 
 /**

src/Engine/ModInfo.cpp

@@ -180,7 +180,7 @@ struct EngineData
  * List of engines that current version support.
  */
 const EngineData supportedEngines[] = {
-	{ OPENXCOM_VERSION_ENGINE, { OPENXCOM_VERSION_NUMBER }},
+	{ OPENXCOM_VERSION_ENGINE, { OPENXCOM_VERSION_OXCE_NUMBER }},
 	{ "", { 0, 0, 0, 0 } }, // assume that every engine support mods from base game, remove if its not true.
 };
 
@@ -314,11 +314,11 @@ static auto dummy = ([]
 		return std::array<int, 4>{{i, j, k, l}};
 	};
 
-	assert(findCompatibleEngine(supportedEngines, "Extended", create(OPENXCOM_VERSION_NUMBER)));
+	assert(findCompatibleEngine(supportedEngines, "Extended", create(OPENXCOM_VERSION_OXCE_NUMBER)));
 	assert(findCompatibleEngine(supportedEngines, "Extended", create(1, 0, 0, 0)));
 	assert(findCompatibleEngine(supportedEngines, "", create(0, 0, 0, 0)));
-	assert(!findCompatibleEngine(supportedEngines, "Extended", create(OPENXCOM_VERSION_NUMBER + 1)));
-	assert(!findCompatibleEngine(supportedEngines, "XYZ", create(OPENXCOM_VERSION_NUMBER)));
+	assert(!findCompatibleEngine(supportedEngines, "Extended", create(OPENXCOM_VERSION_OXCE_NUMBER + 1)));
+	assert(!findCompatibleEngine(supportedEngines, "XYZ", create(OPENXCOM_VERSION_OXCE_NUMBER)));
 	assert(!findCompatibleEngine(supportedEngines, "XYZ", create(0, 0, 0, 0)));
 
 

src/version.h

@@ -36,6 +36,16 @@
 // mod's own build version, e.g. 8.4.13201) - bump it by hand on each OXCE rebase.
 #define OPENXCOM_VERSION_OXCE "8.4.2"
 
+// Numeric form of OPENXCOM_VERSION_OXCE, for OXCE engine-compat checks (mod
+// requiredExtendedVersion in ModInfo.cpp) and the update check
+// (CrossPlatform::isHigherThanCurrentVersion). Like OPENXCOM_VERSION_OXCE it is
+// NEVER stamped by CI - bump both together on each OXCE rebase. The stamped
+// OPENXCOM_VERSION_NUMBER above is the coop mod's own version (e.g. 2,0,0,0)
+// and must never be used for OXCE compatibility comparisons: a coop version
+// numerically below the OXCE version would silently fail every mod's
+// engine-version requirement.
+#define OPENXCOM_VERSION_OXCE_NUMBER 8,4,2,0
+
 // Release channel of this build; stamped by tools/ci/stamp_version.sh.
 // Local/dev builds keep "dev".
 #ifndef OPENXCOM_VERSION_CHANNEL