bugfix: Don't read file for InteractiveSemanticdbdb if it doesn't exist

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

@@ -8,7 +8,6 @@ import scala.util.Success
 import scala.util.Try
 
 import scala.meta.internal.builds.SbtBuildTool
-import scala.meta.internal.io.FileIO
 import scala.meta.internal.metals.Messages._
 import scala.meta.internal.metals.MetalsEnrichments._
 import scala.meta.internal.metals.clients.language.MetalsLanguageClient
@@ -42,6 +41,7 @@ final class InteractiveSemanticdbs(
     clientConfig: ClientConfiguration,
     semanticdbIndexer: () => SemanticdbIndexer,
     javaInteractiveSemanticdb: Option[JavaInteractiveSemanticdb],
+    buffers: Buffers,
 ) extends Cancelable
     with Semanticdbs {
 
@@ -87,18 +87,25 @@ final class InteractiveSemanticdbs(
       val result = textDocumentCache.compute(
         source,
         (path, existingDoc) => {
-          val text = unsavedContents.getOrElse(FileIO.slurp(source, charset))
-          val sha = MD5.compute(text)
-          if (existingDoc == null || existingDoc.md5 != sha) {
-            Try(compile(path, text)) match {
-              case Success(doc) if doc != null =>
-                if (!source.isDependencySource(workspace))
-                  semanticdbIndexer().onChange(source, doc)
-                doc
-              case _ => null
-            }
-          } else
-            existingDoc
+          unsavedContents.orElse(buffers.get(source).orElse {
+            if (source.exists) Some(source.readText(charset))
+            else None
+          }) match {
+            case None => null
+            case Some(text) =>
+              val sha = MD5.compute(text)
+              if (existingDoc == null || existingDoc.md5 != sha) {
+                Try(compile(path, text)) match {
+                  case Success(doc) if doc != null =>
+                    if (!source.isDependencySource(workspace))
+                      semanticdbIndexer().onChange(source, doc)
+                    doc
+                  case _ => null
+                }
+              } else
+                existingDoc
+          }
+
         },
       )
       TextDocumentLookup.fromOption(source, Option(result))

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

@@ -367,6 +367,7 @@ class MetalsLspService(
         clientConfig,
         () => semanticDBIndexer,
         javaInteractiveSemanticdb,
+        buffers,
       )
     )
   }

mtags/src/main/scala/scala/meta/internal/mtags/ScalametaCommonEnrichments.scala

@@ -1,6 +1,7 @@
 package scala.meta.internal.mtags
 
 import java.net.URI
+import java.nio.charset.Charset
 import java.nio.charset.StandardCharsets
 import java.nio.file.Files
 import java.nio.file.Path
@@ -285,8 +286,12 @@ trait ScalametaCommonEnrichments extends CommonMtagsEnrichments {
       }
     }
 
+    def readText(charset: Charset): String = {
+      FileIO.slurp(path, charset)
+    }
+
     def readText: String = {
-      FileIO.slurp(path, StandardCharsets.UTF_8)
+      readText(StandardCharsets.UTF_8)
     }
 
     def readTextOpt: Option[String] = {