Add tests that verify private members are filtered

Author: rochala

presentation-compiler/src/main/dotty/tools/pc/completions/CompletionProvider.scala

@@ -32,7 +32,6 @@ import org.eclipse.lsp4j.InsertTextFormat
 import org.eclipse.lsp4j.InsertTextMode
 import org.eclipse.lsp4j.Range as LspRange
 import org.eclipse.lsp4j.TextEdit
-import dotty.tools.dotc.cc.CaptureSet.empty
 
 class CompletionProvider(
     search: SymbolSearch,

presentation-compiler/test/dotty/tools/pc/tests/completion/CompletionExtraConstructorSuite.scala

@@ -552,3 +552,16 @@ class CompletionExtraConstructorSuite extends BaseCompletionSuite:
          |""".stripMargin
     )
 
+  @Test def `dont-include-private-members` =
+    check(
+      """|object TestObject:
+         |  private def apply(i: Int) = i
+         |object Main:
+         |  TestObject@@
+         |""".stripMargin,
+      """|TestClass($0)
+         |new Wrapper.TestClass
+         |TestClass
+         |""".stripMargin
+    )
+