Fix IsUntitledPath logic (#1332)

Author: TylerLeonhardt

src/PowerShellEditorServices/Services/TextDocument/ScriptFile.cs

@@ -217,7 +217,7 @@ internal static List<string> GetLinesInternal(string text)
         internal static bool IsUntitledPath(string path)
         {
             Validate.IsNotNull(nameof(path), path);
-            return string.Equals(
+            return !string.Equals(
                 DocumentUri.From(path).Scheme,
                 Uri.UriSchemeFile,
                 StringComparison.OrdinalIgnoreCase);

test/PowerShellEditorServices.Test/Session/ScriptFileTests.cs

@@ -658,5 +658,17 @@ public void DocumentUriRetunsCorrectStringForAbsolutePath()
                 Assert.Equal("file:///home/JamesHolden/projects/Rocinate/Proto%3AMole%5Ccule.ps1", scriptFile.DocumentUri);
             }
         }
+
+        [Trait("Category", "ScriptFile")]
+        [Theory]
+        [InlineData("C:\\Users\\me\\Documents\\test.ps1", false)]
+        [InlineData("/Users/me/Documents/test.ps1", false)]
+        [InlineData("vscode-notebook-cell:/Users/me/Documents/test.ps1#0001", true)]
+        [InlineData("https://microsoft.com", true)]
+        [InlineData("Untitled:Untitled-1", true)]
+        public void IsUntitledFileIsCorrect(string path, bool expected)
+        {
+            Assert.Equal(expected, ScriptFile.IsUntitledPath(path));
+        }
     }
 }