workaround bug on builds handled by sbt 2.0.0-M4

Author: bjaglin

build.sbt

@@ -54,6 +54,7 @@ pluginCrossBuild / sbtVersion := {
     case "2.12" =>
       "1.4.0"
     case _ =>
+      // remove SemanticdbCachingWorkaroundPlugin when bumping
       "2.0.0-M4" // bin/test-release.sh
   }
 }

src/main/scala-3/scalafix/internal/sbt/SemanticdbCachingWorkaroundPlugin.scala

@@ -0,0 +1,32 @@
+import sbt.*
+import sbt.Keys.*
+import sbt.plugins.JvmPlugin
+import sbt.util.CacheImplicits.given
+
+// https://github.com/sbt/sbt/pull/8086
+object SemanticdbCachingWorkaroundPlugin extends AutoPlugin {
+
+  override def trigger: PluginTrigger = allRequirements
+  override def requires: Plugins = JvmPlugin
+
+  override lazy val projectSettings: Seq[Def.Setting[?]] =
+    Seq(Compile, Test).flatMap(c =>
+      inConfig(c)(
+        compileIncremental := Def.taskIf {
+          if (semanticdbIncludeInJar.value || !semanticdbEnabled.value)
+            compileIncremental.value
+          else compileIncAndCacheSemanticdbTargetRootTask.value
+        }.value
+      )
+    )
+
+  private val compileIncAndCacheSemanticdbTargetRootTask = Def.cachedTask {
+    val prev = compileIncremental.value
+    val converter = fileConverter.value
+    val targetRoot = semanticdbTargetRoot.value
+
+    val vfTargetRoot = converter.toVirtualFile(targetRoot.toPath)
+    Def.declareOutputDirectory(vfTargetRoot)
+    prev
+  }
+}