drop sbt 1.3.x support

build.sbt

@@ -48,15 +48,15 @@ libraryDependencies ++= List(
 scalaVersion := "2.12.19"
 
 // keep this as low as possible to avoid running into binary incompatibility such as https://github.com/sbt/sbt/issues/5049
-pluginCrossBuild / sbtVersion := "1.3.1"
+pluginCrossBuild / sbtVersion := "1.4.0"
 
 scriptedSbt := {
   val jdk = System.getProperty("java.specification.version").toDouble
 
   if (jdk >= 21)
     "1.9.0" // first release that supports JDK21
   else
-    "1.3.3" // get https://github.com/sbt/sbt/issues/1673 to avoid race conditions
+    (pluginCrossBuild / sbtVersion).value
 }
 
 libraryDependencies += compilerPlugin(scalafixSemanticdb)

src/main/scala/sbt/internal/sbtscalafix/JLineAccess.scala

@@ -2,5 +2,5 @@ package sbt.internal.sbtscalafix
 
 /** Helper class to access sbt's JLine instance */
 object JLineAccess {
-  def terminalWidth: Int = sbt.internal.util.JLine.usingTerminal(_.getWidth)
+  def terminalWidth: Int = sbt.internal.util.Terminal.get.getWidth
 }

src/main/scala/scalafix/sbt/ScalafixEnable.scala

@@ -172,13 +172,7 @@ object ScalafixEnable {
                     )
                 }
             }
-          } ++ Seq(
-          semanticdbEnabled := true,
-          // support sbt 1.3.[0-3] which does not contain
-          // https://github.com/sbt/sbt/pull/5202
-          (semanticdbCompilerPlugin := semanticdbCompilerPlugin.value
-            .withRevision((semanticdbVersion).value))
-        )
+          } :+ (semanticdbEnabled := true)
       settings <-
         inScope(ThisScope.copy(project = Select(project.ref)))(
           scalacOptionsSettings ++ enableSemanticdbPlugin

src/main/scala/scalafix/sbt/ScalafixPlugin.scala

@@ -625,11 +625,11 @@ object ScalafixPlugin extends AutoPlugin {
         ): Unit = implicitly[JsonWriter[A]].write(obj, builder)
       }
 
-      // we actually don't need to read anything back, see https://github.com/sbt/sbt/pull/5513
+      // implicit conversion of collection is only available on JsonFormat
       implicit val argFormat = liftFormat(argWriter)
 
       def diffWithPreviousRuns[T](f: (Boolean, Set[File]) => T): T = {
-        val tracker = Tracked.inputChanged(streams.cacheDirectory / "args") {
+        val tracker = Tracked.inputChangedW(streams.cacheDirectory / "args") {
           (argsChanged: Boolean, _: Seq[Arg.CacheKey]) =>
             val targets = paths.map(_.toFile).toSet
 
@@ -708,21 +708,14 @@ object ScalafixPlugin extends AutoPlugin {
       shellArgs: ShellArgs,
       config: ConfigKey
   ): Def.Initialize[Task[Seq[Path]]] =
-    Def.taskDyn {
-      // Dynamic task to avoid redundantly computing `unmanagedSources.value`
-      if (shellArgs.files.nonEmpty) {
-        Def.task {
-          shellArgs.files.map(file(_).toPath)
-        }
-      } else {
-        Def.task {
-          for {
-            source <- (config / scalafix / unmanagedSources).value
-            if source.exists()
-            if isScalaFile(source)
-          } yield source.toPath
-        }
-      }
+    Def.taskIf {
+      if (shellArgs.files.nonEmpty) shellArgs.files.map(file(_).toPath)
+      else
+        for {
+          source <- (config / scalafix / unmanagedSources).value
+          if source.exists()
+          if isScalaFile(source)
+        } yield source.toPath
     }
 
   private[sbt] val relaxScalacOptionsConfigSettings: Seq[Def.Setting[_]] =

src/sbt-test/sbt-scalafix/explicit-files/build.sbt

@@ -1,12 +1,10 @@
 import _root_.scalafix.sbt.{BuildInfo => Versions}
 
-// support sbt 1.3.x, see https://github.com/sbt/sbt/issues/5110
-Global / semanticdbVersion := scalafixSemanticdb.revision
-
 inThisBuild(
   List(
     scalaVersion := Versions.scala212,
     scalacOptions += "-Ywarn-unused",
+    semanticdbVersion := scalafixSemanticdb.revision,
     semanticdbEnabled := true
   )
 )

src/sbt-test/sbt-scalafix/semanticdb-enabled/build.sbt

@@ -1,6 +1,9 @@
-// support sbt 1.3.x, see https://github.com/sbt/sbt/issues/5110
-Global / semanticdbVersion := scalafixSemanticdb.revision
-ThisBuild / semanticdbEnabled := true
+inThisBuild(
+  List(
+    semanticdbVersion := scalafixSemanticdb.revision,
+    semanticdbEnabled := true
+  )
+)
 
 lazy val scala212 = project
   .settings(