Exclude MDoc dependencies on project's classpath to avoid conflicts

metals/src/main/scala/scala/meta/internal/metals/Embedded.scala

@@ -135,17 +135,7 @@ final class Embedded(
 
     // Full mdoc classpath seems to be causing some issue with akka
     // We want to keep a minimal set of jars needed here
-    val runtimeClasspath = jars.filter { path =>
-      val pathString = path.toString
-      pathString.contains("scala-lang") ||
-      pathString.contains("fansi") ||
-      pathString.contains("pprint") ||
-      pathString.contains("sourcecode") ||
-      pathString.contains("mdoc") ||
-      pathString.contains("scalameta") ||
-      pathString.contains("metaconfig") ||
-      pathString.contains("diffutils")
-    }
+    val runtimeClasspath = jars.filter(Embedded.filterMDocLibraries)
     val urls = runtimeClasspath.iterator.map(_.toUri().toURL()).toArray
     new URLClassLoader(urls, parent)
   }
@@ -335,4 +325,16 @@ object Embedded {
     downloadDependency(dependency, Some(scalaVersion))
   }
 
+  def filterMDocLibraries(path: Path) = {
+    val pathString = path.toString
+    pathString.contains("scala-lang") ||
+    pathString.contains("fansi") ||
+    pathString.contains("pprint") ||
+    pathString.contains("sourcecode") ||
+    pathString.contains("mdoc") ||
+    pathString.contains("scalameta") ||
+    pathString.contains("metaconfig") ||
+    pathString.contains("diffutils")
+  }
+
 }

metals/src/main/scala/scala/meta/internal/worksheets/WorksheetProvider.scala

@@ -421,7 +421,12 @@ class WorksheetProvider(
           .asJava
         val mdoc = embedded
           .mdoc(info.scalaVersion)
-          .withClasspath(info.fullClasspath.distinct.asJava)
+          .withClasspath(
+            info.fullClasspath
+              .filterNot(Embedded.filterMDocLibraries)
+              .distinct
+              .asJava
+          )
           .withScalacOptions(scalacOptions)
         mdocs(key) = MdocRef(scalaVersion, mdoc)
         mdoc

tests/unit/src/test/scala/tests/worksheets/WorksheetLspSuite.scala

@@ -186,4 +186,28 @@ class WorksheetLspSuite extends tests.BaseWorksheetLspSuite(V.scala213) {
       _ = assertNoDiagnostics()
     } yield ()
   }
+
+  test("pprint") {
+    cleanWorkspace()
+    val path = "a/src/main/scala/hi.worksheet.sc"
+    for {
+      _ <- initialize(
+        s"""
+           |/metals.json
+           |{
+           |  "a": {
+           |    "libraryDependencies": ["com.lihaoyi::pprint:0.6.0"]
+           |  }
+           |}
+           |/${path}
+           |new java.sql.Date(100L)
+           |""".stripMargin
+      )
+      _ <- server.didOpen(path)
+      _ = assertNoDiff(
+        client.workspaceDecorations,
+        "new java.sql.Date(100L) // : java.sql.Date = 1970-01-01",
+      )
+    } yield ()
+  }
 }