Update for Metals v0.6 (#81)

* Add custom metals/windowStateDidChange notification

Author: laughedelic

src/main/scala/servers/Metals.scala

@@ -26,7 +26,7 @@ class HtmlView(title: String) extends js.Object {
 object Metals extends ScalaLanguageServer { server =>
   val name: String = "metals"
   val description: String = "Metals"
-  val defaultVersion: String = "0.5.2"
+  val defaultVersion: String = "0.6.1"
 
   def trigger(projectPath: String): Boolean = {
     (projectPath / ".metals").isDirectory
@@ -109,6 +109,21 @@ object Metals extends ScalaLanguageServer { server =>
         }
       })
 
+    // Send windowStateDidChange notification to Metals every time window is in/out of focus
+    Atom.asInstanceOf[js.Dynamic].getCurrentWindow()
+      .on("focus", { _: js.Any =>
+        connection.sendCustomNotification(
+          "metals/windowStateDidChange",
+          js.Dynamic.literal("focused" -> true)
+        )
+      })
+      .on("blur", { _: js.Any =>
+        connection.sendCustomNotification(
+          "metals/windowStateDidChange",
+          js.Dynamic.literal("focused" -> false)
+        )
+      })
+
     Atom.workspace.onDidChangeActiveTextEditor { editorOrUndef =>
       for {
         editor <- editorOrUndef