Dotty IDE: Do not highlight constructors

They're always synthetic, they shouldn't be highlighted.

Author: Duhemm

language-server/src/dotty/tools/languageserver/DottyLanguageServer.scala

@@ -382,7 +382,7 @@ class DottyLanguageServer extends LanguageServer
     else {
       val refs = Interactive.namedTrees(uriTrees, Include.references | Include.overriding, sym)
       (for {
-        ref <- refs
+        ref <- refs if !ref.tree.symbol.isConstructor
         nameRange <- range(ref.namePos)
       } yield new DocumentHighlight(nameRange, DocumentHighlightKind.Read)).asJava
     }

language-server/test/dotty/tools/languageserver/HighlightTest.scala

@@ -19,4 +19,10 @@ class HighlightTest {
       .highlight(xRef.range, (xDef.range, DocumentHighlightKind.Read), (xRef.range, DocumentHighlightKind.Read))
   }
 
+  @Test def highlightClass(): Unit = {
+    code"""class ${m1}Foo${m2} { new ${m3}Foo${m4} }""".withSource
+      .highlight(m1 to m2, (m1 to m2, DocumentHighlightKind.Read), (m3 to m4, DocumentHighlightKind.Read))
+      .highlight(m3 to m4, (m1 to m2, DocumentHighlightKind.Read), (m3 to m4, DocumentHighlightKind.Read))
+  }
+
 }