Use compiler context to generate project name

FIx problem with named type parameters in example project.

Author: romanowski

sbt-dotty/src/dotty/tools/sbtplugin/DottyPlugin.scala

@@ -360,7 +360,7 @@ object DottyPlugin extends AutoPlugin {
         Resolver.bintrayRepo("virtuslab", "dokka"),
       ),
       useScala3doc := false,
-      scala3docOptions := Seq("-n", name.value),
+      scala3docOptions := Nil,
       Compile / doc / scalacOptions := {
         val s3dOpts = scala3docOptions.value.map("--+DOC+" + _)
         val s3cOpts = (Compile / doc / scalacOptions).value

scala3doc/example-project/src/main/scala/NamedTypeArguments.scala

@@ -1,5 +1,7 @@
 package example
 
+import experimental.namedTypeArguments
+
 /**
   * Named Type Arguments: https://dotty.epfl.ch/docs/reference/other-new-features/named-typeargs.html
   */

scala3doc/src/dotty/tools/dottydoc/Main.scala

@@ -55,6 +55,7 @@ object Main extends Driver {
       val requiredArgs = Seq(
         "--tastyRoots", "", // hack, value is not used in SBT but required in CLI
         // we extract some settings from Dotty options since that's how SBT passes them
+        "--name", ctx.settings.projectName.value,
         "--projectTitle", ctx.settings.projectName.value,
         "--output", ctx.settings.outputDir.value.toString,
       )