Avoid exception in ScriptFile.IsUntitledPath()

Since we could theoretically receive any complicated string.

Author: andyleejordan

src/PowerShellEditorServices/Services/TextDocument/ScriptFile.cs

@@ -195,18 +195,17 @@ internal static List<string> GetLinesInternal(string text)
         }
 
         /// <summary>
-        /// Deterines whether the supplied path indicates the file is an "untitled:Unitled-X"
+        /// Determines whether the supplied path indicates the file is an "untitled:Untitled-X"
         /// which has not been saved to file.
         /// </summary>
         /// <param name="path">The path to check.</param>
         /// <returns>True if the path is an untitled file, false otherwise.</returns>
         internal static bool IsUntitledPath(string path)
         {
             Validate.IsNotNull(nameof(path), path);
-            return !string.Equals(
-                DocumentUri.From(path).Scheme,
-                Uri.UriSchemeFile,
-                StringComparison.OrdinalIgnoreCase);
+            // This may not have been given a URI, so return false instead of throwing.
+            return Uri.IsWellFormedUriString(path, UriKind.RelativeOrAbsolute) &&
+                !string.Equals(DocumentUri.From(path).Scheme, Uri.UriSchemeFile, StringComparison.OrdinalIgnoreCase);
         }
 
         /// <summary>

test/PowerShellEditorServices.Test/Session/ScriptFileTests.cs

@@ -651,6 +651,7 @@ public void DocumentUriReturnsCorrectStringForAbsolutePath()
         [InlineData("vscode-notebook-cell:/Users/me/Documents/test.ps1#0001", true)]
         [InlineData("https://microsoft.com", true)]
         [InlineData("Untitled:Untitled-1", true)]
+        [InlineData("'a log statement' > 'c:\\Users\\me\\Documents\\test.txt'\r\n", false)]
         public void IsUntitledFileIsCorrect(string path, bool expected) => Assert.Equal(expected, ScriptFile.IsUntitledPath(path));
     }
 }