Always remap changing deps

src/main/java/net/fabricmc/loom/configuration/mods/ArtifactRef.java

@@ -52,9 +52,11 @@ public interface ArtifactRef {
 
 	@Nullable String classifier();
 
+	boolean changing();
+
 	void applyToConfiguration(Project project, Configuration configuration);
 
-	record ResolvedArtifactRef(ResolvedArtifact artifact, @Nullable Path sources) implements ArtifactRef {
+	record ResolvedArtifactRef(ResolvedArtifact artifact, @Nullable Path sources, boolean changing) implements ArtifactRef {
 		@Override
 		public Path path() {
 			return artifact.getFile().toPath();
@@ -101,6 +103,11 @@ record FileArtifactRef(Path path, String group, String name, String version) imp
 			return null;
 		}
 
+		@Override
+		public boolean changing() {
+			return false;
+		}
+
 		@Override
 		public void applyToConfiguration(Project project, Configuration configuration) {
 			final DependencyHandler dependencies = project.getDependencies();

src/main/java/net/fabricmc/loom/configuration/mods/ModConfigurationRemapper.java

@@ -40,7 +40,10 @@
 import com.google.common.collect.ImmutableMap;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.DependencySet;
+import org.gradle.api.artifacts.ExternalModuleDependency;
 import org.gradle.api.artifacts.FileCollectionDependency;
+import org.gradle.api.artifacts.ModuleVersionIdentifier;
 import org.gradle.api.artifacts.MutableVersionConstraint;
 import org.gradle.api.artifacts.ResolvedArtifact;
 import org.gradle.api.artifacts.dsl.DependencyHandler;
@@ -242,15 +245,23 @@ private static void createConstraints(ArtifactRef artifact, Configuration target
 
 	private static List<ArtifactRef> resolveArtifacts(Project project, Configuration configuration) {
 		final List<ArtifactRef> artifacts = new ArrayList<>();
+		final DependencySet allDependencies = configuration.getAllDependencies();
+		final List<String> changingDependencies = allDependencies.withType(ExternalModuleDependency.class)
+				.matching(ExternalModuleDependency::isChanging)
+				.stream()
+				.map(dependency -> "%s:%s:%s".formatted(dependency.getGroup(), dependency.getName(), dependency.getVersion()))
+				.toList();
 
 		for (ResolvedArtifact artifact : configuration.getResolvedConfiguration().getResolvedArtifacts()) {
 			final Path sources = findSources(project, artifact);
-			artifacts.add(new ArtifactRef.ResolvedArtifactRef(artifact, sources));
+			final ModuleVersionIdentifier moduleId = artifact.getModuleVersion().getId();
+			final String id = "%s:%s:%s".formatted(moduleId.getGroup(), moduleId.getName(), moduleId.getVersion());
+			artifacts.add(new ArtifactRef.ResolvedArtifactRef(artifact, sources, changingDependencies.contains(id)));
 		}
 
 		// FileCollectionDependency (files/fileTree) doesn't resolve properly,
 		// so we have to "resolve" it on our own. The naming is "abc.jar" => "unspecified:abc:unspecified".
-		for (FileCollectionDependency dependency : configuration.getAllDependencies().withType(FileCollectionDependency.class)) {
+		for (FileCollectionDependency dependency : allDependencies.withType(FileCollectionDependency.class)) {
 			final String group = replaceIfNullOrEmpty(dependency.getGroup(), () -> MISSING_GROUP);
 			final FileCollection files = dependency.getFiles();
 

src/main/java/net/fabricmc/loom/configuration/mods/dependency/SimpleModDependency.java

@@ -48,7 +48,7 @@ public SimpleModDependency(ArtifactRef artifact, ArtifactMetadata metadata, Stri
 
 	@Override
 	public boolean isCacheInvalid(Project project, @Nullable String variant) {
-		return !maven.exists(variant);
+		return getInputArtifact().changing() || !maven.exists(variant);
 	}
 
 	@Override

src/main/java/net/fabricmc/loom/configuration/mods/dependency/SplitModDependency.java

@@ -59,6 +59,10 @@ public SplitModDependency(ArtifactRef artifact, ArtifactMetadata metadata, Strin
 
 	@Override
 	public boolean isCacheInvalid(Project project, @Nullable String variant) {
+		if (getInputArtifact().changing()) {
+			return true;
+		}
+
 		boolean exists = switch (target) {
 		case COMMON_ONLY -> getCommonMaven().exists(variant);
 		case CLIENT_ONLY -> getClientMaven().exists(variant);

src/test/resources/projects/localFileDependency/build.gradle

@@ -31,6 +31,11 @@ dependencies {
 	modImplementation fileTree("myFileTree") // an entire file tree
 	modImplementation name: "test-data-e" // a flatDir dependency
 
+	// Test changing
+	modImplementation("net.fabricmc:fabric-loom-native-support:1.0.0") {
+		changing = true
+	}
+
 	// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
 	// You may need to force-disable transitiveness on them.
 }