Fix detection of changed packages

.github/workflows/check.yml

@@ -84,3 +84,21 @@ jobs:
       - name: Audit dependencies
         run: cargo audit
 
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    if: |
+      startsWith(github.event.pull_request.head.ref, 'release/')
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.sha }}
+
+      - name: Check commit count
+        run: |
+          COUNT=$(git rev-list --count HEAD ^origin/master)
+          if [ "$COUNT" -ne 1 ]; then
+            echo "Release branch must contain exactly one commit, found $COUNT"
+            exit 1
+          fi

crates/mono/src/cli/command/version/changed.rs

@@ -27,9 +27,10 @@
 
 use clap::Args;
 use semver::Version;
+use std::cmp;
 
 use mono_changeset::Changeset;
-use mono_project::version::VersionExt;
+use mono_project::version::{Increment, VersionExt};
 use mono_project::Manifest;
 
 use crate::cli::{Command, Result};
@@ -66,13 +67,27 @@ where
         }
 
         // Obtain version increments, which denote which packages have changed,
-        // and traverse dependents to list changed packages in topological order
-        let increments = changeset.increments();
+        // and if a version is given, ensure that all packages that were bumped
+        // in the given version are marked as changed, since there might be
+        // transitive changes that only affect dependencies
+        let mut increments = changeset.increments().to_vec();
+        if self.version.is_some() {
+            let scopes = changeset.scopes();
+            if let Some(first) = changeset.revisions().first() {
+                for delta in first.commit().deltas()? {
+                    if let Some(node) = scopes.get(delta.path()) {
+                        increments[node] =
+                            cmp::max(increments[node], Some(Increment::Patch));
+                    }
+                }
+            }
+        }
+
+        // Traverse dependents in topological order, and write names of changed
+        // packages to standard output if they have a version increment
         let dependents = context.workspace.dependents()?;
         for node in &dependents {
-            // In case no versions have been created so far, all packages must
-            // be considered changed to be included in the initial release
-            if increments[node].is_some() || versions.is_empty() {
+            if increments[node].is_some() {
                 let name = dependents[node].name().expect("invariant");
                 println!("{name}");
             }