improvement: Don't sent text on didSave

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

@@ -884,9 +884,9 @@ abstract class MetalsLspService(
   ): CompletableFuture[Unit] = {
     val path = params.getTextDocument.getUri.toAbsolutePath
     savedFiles.add(path)
-    // read file from disk, we only remove files from buffers on didClose.
-    val text = path.toInput.text
-    buffers.put(path, text)
+    if (!buffers.contains(path)) {
+      buffers.put(path, path.toInput.text)
+    }
     Future
       .sequence(
         List(

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

@@ -1215,7 +1215,10 @@ class WorkspaceLspService(
 
         val textDocumentSyncOptions = new lsp4j.TextDocumentSyncOptions
         textDocumentSyncOptions.setChange(lsp4j.TextDocumentSyncKind.Full)
-        textDocumentSyncOptions.setSave(new lsp4j.SaveOptions(true))
+        // We don't use the text at all.
+        textDocumentSyncOptions.setSave(
+          new lsp4j.SaveOptions( /* includeText = */ false)
+        )
         textDocumentSyncOptions.setOpenClose(true)
 
         val scalaFilesPattern = new lsp4j.FileOperationPattern("**/*.scala")

tests/slow/src/test/scala/tests/bazel/BazelLspSuite.scala

@@ -234,7 +234,7 @@ class BazelLspSuite
         BazelBuildLayout(workspaceLayout, V.bazelScalaVersion, bazelVersion)
       )
       _ <- server.didOpen("Hello.scala")
-      _ <- server.didSave("Hello.scala") { _ =>
+      _ <- server.didChange("Hello.scala") { _ =>
         """|package examples.scala3
            |
            |sealed trait A
@@ -251,6 +251,7 @@ class BazelLspSuite
            |}
            |""".stripMargin
       }
+      _ <- server.didSave("Hello.scala")(identity)
       _ = assertNoDiff(
         server.client.workspaceDiagnostics,
         """|Hello.scala:11:3: warning: match may not be exhaustive.
@@ -262,12 +263,13 @@ class BazelLspSuite
            |""".stripMargin,
       )
       // warnings should not disappear after updating
-      _ <- server.didSave("Hello.scala") { text =>
+      _ <- server.didChange("Hello.scala") { text =>
         s"""|$text
             |
             |class Additional
             |""".stripMargin
       }
+      _ <- server.didSave("Hello.scala")(identity)
       _ = assertNoDiff(
         server.client.workspaceDiagnostics,
         """|Hello.scala:11:3: warning: match may not be exhaustive.

tests/slow/src/test/scala/tests/feature/SyntaxErrorLspSuite.scala

@@ -76,15 +76,17 @@ class SyntaxErrorLspSuite extends BaseLspSuite("syntax-error") {
       _ = assertNoDiff(client.workspaceDiagnostics, "")
       _ <- server.didOpen("Main.scala")
       _ <- server.didOpen("project/plugins.sbt")
-      _ <- server.didSave("Main.scala")(_ => "object A\n")
+      _ <- server.didChange("Main.scala")(_ => "object A\n")
+      _ <- server.didSave("Main.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|project/plugins.sbt:1:8: error: `identifier` expected but `object` found
            |object object val x = 1
            |       ^^^^^^
            |""".stripMargin,
       )
-      _ <- server.didSave("project/plugins.sbt")(_ => "lazy val x = 1\n")
+      _ <- server.didChange("project/plugins.sbt")(_ => "lazy val x = 1\n")
+      _ <- server.didSave("project/plugins.sbt")(identity)
       _ = assertNoDiff(client.workspaceDiagnostics, "")
     } yield ()
   }

tests/slow/src/test/scala/tests/sbt/SbtServerSuite.scala

@@ -194,11 +194,12 @@ class SbtServerSuite
       )
       // reload build after build.sbt changes
       _ <- server.executeCommand(ServerCommands.ResetNotifications)
-      _ <- server.didSave("build.sbt") { text =>
+      _ <- server.didChange("build.sbt") { text =>
         s"""$text
            |ibraryDependencies += "com.lihaoyi" %% "sourcecode" % "0.3.0"
            |""".stripMargin
       }
+      _ <- server.didSave("build.sbt")(identity)
       _ = {
         assertNoDiff(
           client.workspaceErrorShowMessages,
@@ -209,9 +210,10 @@ class SbtServerSuite
       // This is a little hacky but up above this promise is succeeded already, so down
       // below it won't wait until it reconnects to Sbt and indexed like we want
       _ = server.server.indexingPromise = Promise()
-      _ <- server.didSave("build.sbt") { text =>
+      _ <- server.didChange("build.sbt") { text =>
         text.replace("ibraryDependencies", "libraryDependencies")
       }
+      _ <- server.didSave("build.sbt")(identity)
       _ = {
         assert(client.workspaceErrorShowMessages.isEmpty)
       }
@@ -231,7 +233,7 @@ class SbtServerSuite
            |        ^^^
            |""".stripMargin,
       )
-      _ <- server.didSave("build.sbt") { text =>
+      _ <- server.didChange("build.sbt") { text =>
         text.replace(
           "val a = project.in(file(\"a\"))",
           """|val a = project.in(file("a")).settings(
@@ -240,15 +242,17 @@ class SbtServerSuite
              |""".stripMargin,
         )
       }
+      _ <- server.didSave("build.sbt")(identity)
       _ = {
         assert(client.workspaceErrorShowMessages.isEmpty)
       }
-      _ <- server.didSave("a/src/main/scala/A.scala") { _ =>
+      _ <- server.didChange("a/src/main/scala/A.scala") { _ =>
         """|object A{
            |  val a: scala.meta.Defn.Class = ???
            |}
            |""".stripMargin
       }
+      _ <- server.didSave("a/src/main/scala/A.scala")(identity)
       _ <- server.assertHoverAtLine(
         "a/src/main/scala/A.scala",
         "  val a: scala.meta.Defn.C@@lass = ???",

tests/unit/src/main/scala/tests/BaseAmmoniteSuite.scala

@@ -168,9 +168,10 @@ abstract class BaseAmmoniteSuite(scalaVersion: String)
         server.client.workspaceShowMessages,
         s"Error importing Scala script ${workspace.resolve("main.sc")}. See the logs for more details.",
       )
-      _ <- server.didSave("main.sc") { text =>
+      _ <- server.didChange("main.sc") { text =>
         text.replace(fakeScalaVersion, scalaVersion)
       }
+      _ <- server.didSave("main.sc")(identity)
       _ <- server.server.indexingPromise.future
       targets <- server.executeCommand(ServerCommands.ListBuildTargets)
       _ = assertEquals(

tests/unit/src/main/scala/tests/BaseRenameLspSuite.scala

@@ -97,7 +97,8 @@ abstract class BaseRenameLspSuite(name: String) extends BaseLspSuite(name) {
         // possible breaking changes for testing
         _ <- Future.sequence {
           openedFiles.map { file =>
-            server.didSave(file) { code => breakingChange(code) }
+            server.didChange(file) { code => breakingChange(code) }
+            server.didSave(file)(identity)
           }
         }
         _ = if (!expectedError) assertNoDiagnostics()
@@ -124,9 +125,12 @@ abstract class BaseRenameLspSuite(name: String) extends BaseLspSuite(name) {
                     Future
                       .sequence {
                         files.map { case (file, code) =>
-                          server.didSave(file)(_ =>
-                            code.replaceAll(allMarkersRegex, "")
-                          )
+                          for {
+                            _ <- server.didChange(file)(_ =>
+                              code.replaceAll(allMarkersRegex, "")
+                            )
+                            _ <- server.didSave(file)(identity)
+                          } yield ()
                         }.toList
 
                       }

tests/unit/src/main/scala/tests/BaseWorksheetLspSuite.scala

@@ -285,12 +285,14 @@ abstract class BaseWorksheetLspSuite(
       _ <- server.didOpen("a/src/main/scala/Main.worksheet.sc")
       _ <- cancelled.future
       _ = client.onWorkDoneProgressStart = (_, _) => {}
-      _ <- server.didSave("a/src/main/scala/Main.worksheet.sc")(
+      _ <- server.didChange("a/src/main/scala/Main.worksheet.sc")(
         _.replace("Stream", "// Stream")
       )
-      _ <- server.didSave("a/src/main/scala/Main.worksheet.sc")(
+      _ <- server.didSave("a/src/main/scala/Main.worksheet.sc")(identity)
+      _ <- server.didChange("a/src/main/scala/Main.worksheet.sc")(
         _.replace("42", "43")
       )
+      _ <- server.didSave("a/src/main/scala/Main.worksheet.sc")(identity)
       _ = assertNoDiff(
         client.syntheticDecorations,
         """|
@@ -469,9 +471,11 @@ abstract class BaseWorksheetLspSuite(
           |a.Util.increase(1) // : Int = 2
           |""".stripMargin,
       )
-      _ <- server.didSave("a/src/main/scala/a/Util.scala")(
+      _ <- server.didChange("a/src/main/scala/a/Util.scala")(
         _.replace("n + 1", "n + 2")
       )
+      _ <- server.didSave("a/src/main/scala/a/Util.scala")(identity)
+      _ <- server.didFocus("a/src/main/scala/a/Main.worksheet.sc")
       _ <- server.didSave("a/src/main/scala/a/Main.worksheet.sc")(identity)
       _ = assertNoDiff(
         client.workspaceDecorations("a/src/main/scala/a/Main.worksheet.sc"),
@@ -782,12 +786,13 @@ abstract class BaseWorksheetLspSuite(
           )
         ),
       )
-      _ <- server.didSave("a/src/main/scala/foo/Main.worksheet.sc")(
+      _ <- server.didChange("a/src/main/scala/foo/Main.worksheet.sc")(
         _.replace(
           "Hi(1, 2, 3)",
           "Hi(7, 8, 9)",
         )
       )
+      _ <- server.didSave("a/src/main/scala/foo/Main.worksheet.sc")(identity)
       export = server.exportEvaluation(
         "a/src/main/scala/foo/Main.worksheet.sc"
       )
@@ -951,9 +956,10 @@ abstract class BaseWorksheetLspSuite(
               Nil,
             )
         _ <- client.applyCodeAction(0, codeActions, server)
-        _ <- server.didSave(path) { _ =>
+        _ <- server.didChange(path) { _ =>
           server.bufferContents(path)
         }
+        _ <- server.didSave(path)(identity)
         // Assert if indentation is correct. See `AutoImports.renderImport`
         _ = assertNoDiff(
           server.bufferContents(path),

tests/unit/src/main/scala/tests/TestingServer.scala

@@ -785,6 +785,7 @@ final case class TestingServer(
     val abspath = toPath(filename)
     val oldText = abspath.toInputFromBuffers(buffers).text
     val newText = fn(oldText)
+    buffers.put(abspath, newText)
     didChange(filename, newText)
   }
 

tests/unit/src/test/scala/tests/BaseNonCompilingLspSuite.scala

@@ -105,9 +105,10 @@ abstract class BaseNonCompilingLspSuite(name: String)
                    |}
                    |""".stripMargin
       input = newText.replace("<<", "").replace(">>", "")
-      _ <- server.didSave("a/src/main/scala/a/A.scala") { _ =>
+      _ <- server.didChange("a/src/main/scala/a/A.scala") { _ =>
         newText.replace("<<", "").replace(">>", "")
       }
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ <-
         server
           .assertCodeAction(
@@ -119,9 +120,10 @@ abstract class BaseNonCompilingLspSuite(name: String)
             kind = Nil,
           )
       // make sure that the now change UniqueObject is not suggested
-      _ <- server.didSave("a/src/main/scala/a/A.scala") { _ =>
+      _ <- server.didChange("a/src/main/scala/a/A.scala") { _ =>
         input.replace("UniqueObjectOther", "UniqueObject")
       }
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ <-
         server
           .assertCodeAction(

tests/unit/src/test/scala/tests/BuildServerConnectionLspSuite.scala

@@ -26,9 +26,10 @@ class BuildServerConnectionLspSuite
       _ = server.server.bspSession.get.cancel()
       _ = assertNoDiagnostics()
       _ <- server.executeCommand(ServerCommands.ConnectBuildServer)
-      _ <- server.didSave("a/src/main/scala/a/A.scala")(
+      _ <- server.didChange("a/src/main/scala/a/A.scala")(
         _.replace("val n = 42", "val n: String = 42")
       )
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|a/src/main/scala/a/A.scala:3:19: error: type mismatch;

tests/unit/src/test/scala/tests/DefinitionLspSuite.scala

@@ -266,9 +266,10 @@ class DefinitionLspSuite
            |}
         """.stripMargin,
       )
-      _ <- server.didSave("a/src/main/scala/a/Main.scala")(
+      _ <- server.didChange("a/src/main/scala/a/Main.scala")(
         _.replace("max(1, 2)", "max")
       )
+      _ <- server.didSave("a/src/main/scala/a/Main.scala")(identity)
       _ = assertNoDiff(
         server.workspaceDefinitions,
         """|/a/src/main/scala/a/Main.scala

tests/unit/src/test/scala/tests/DiagnosticsLspSuite.scala

@@ -355,9 +355,10 @@ class DiagnosticsLspSuite extends BaseLspSuite("diagnostics") {
            |               ^^
            |""".stripMargin,
       )
-      _ <- server.didSave("a/src/main/scala/a/A.scala")(
+      _ <- server.didChange("a/src/main/scala/a/A.scala")(
         _.replace("val n: Int = \"\"", "val n: Int = \" ")
       )
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|a/src/main/scala/a/A.scala:2:16: error: unclosed string literal

tests/unit/src/test/scala/tests/DidFocusLspSuite.scala

@@ -185,23 +185,26 @@ class DidFocusWhileCompilingLspSuite
            |""".stripMargin
       }
       _ = fakeTime.elapseSeconds(10)
-      _ <- server.didSave("a/src/main/scala/a/A.scala")(
+      _ <- server.didChange("a/src/main/scala/a/A.scala")(
         _.replace("1", "\"\"")
       )
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         xMismatch,
       )
-      _ <- server.didSave("b/src/main/scala/b/B.scala")(
+      _ <- server.didChange("b/src/main/scala/b/B.scala")(
         _.replace("2", "\"\"")
       )
+      _ <- server.didSave("b/src/main/scala/b/B.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         xMismatch,
       )
-      _ <- server.didSave("a/src/main/scala/a/A.scala")(
+      _ <- server.didChange("a/src/main/scala/a/A.scala")(
         _.replace("Int", "String")
       )
+      _ <- server.didSave("a/src/main/scala/a/A.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|b/src/main/scala/b/B.scala:3:16: error: type mismatch;

tests/unit/src/test/scala/tests/FingerprintsLspSuite.scala

@@ -33,12 +33,14 @@ class FingerprintsLspSuite extends BaseLspSuite("fingerprints") {
       _ <- server.executeCommand(ServerCommands.CascadeCompile)
       _ = assertNoDiff(client.workspaceDiagnostics, "")
       _ = server.assertReferenceDefinitionBijection()
-      _ <- server.didSave("a/src/main/scala/a/Names.scala")(text =>
+      _ <- server.didChange("a/src/main/scala/a/Names.scala")(text =>
         text.replace("+ surname", "+ surname2")
       )
-      _ <- server.didSave("a/src/main/scala/a/Adresses.scala")(text =>
+      _ <- server.didSave("a/src/main/scala/a/Names.scala")(identity)
+      _ <- server.didChange("a/src/main/scala/a/Adresses.scala")(text =>
         text.replace("+ number", "+ number2")
       )
+      _ <- server.didSave("a/src/main/scala/a/Adresses.scala")(identity)
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|a/src/main/scala/a/Adresses.scala:5:44: error: not found: value number2

tests/unit/src/test/scala/tests/TreeViewLspSuite.scala

@@ -173,7 +173,7 @@ class TreeViewLspSuite extends BaseLspSuite("tree-view") {
            |c symbol-variable
            |""".stripMargin,
       )
-      _ <- server.didSave("a/src/main/scala/a/Zero.scala") { text =>
+      _ <- server.didChange("a/src/main/scala/a/Zero.scala") { text =>
         text.replace("val a = 1", "val a = 1\nval b = 1.0")
       }
       _ = assertEquals(
@@ -191,7 +191,7 @@ class TreeViewLspSuite extends BaseLspSuite("tree-view") {
         s"projects-$folder:${server.buildTarget("a")}!/_root_/",
         isCollapsed = true,
       )
-      _ <- server.didSave("a/src/main/scala/a/Zero.scala") { text =>
+      _ <- server.didChange("a/src/main/scala/a/Zero.scala") { text =>
         text.replace("val a = 1", "val a = 1\nval c = 1.0")
       }
       _ = assertEmpty(

tests/unit/src/test/scala/tests/bestEffort/BestEffortCompilationSuite.scala

@@ -232,6 +232,7 @@ class BestEffortCompilationSuite
            |""".stripMargin
       }
       _ <- server.didOpen("a/src/main/scala/a/A.scala")
+      _ <- server.didOpen("b/src/main/scala/b/B.scala")
       _ = assertNoDiff(
         client.workspaceDiagnostics,
         """|a/src/main/scala/a/A.scala:5:3: error: value completionUnknown is not a member of object B