Terminal: measure characters with Unicode 11 widths, so an emoji takes the two columns the remote counts

tests/DodoSSH.Client.Terminal.Tests/RendererPage.cs

@@ -94,6 +94,14 @@ internal sealed class RendererPage
     public string Typed(uint sessionId) =>
         engine.Evaluate(string.Create(CultureInfo.InvariantCulture, $"typed({sessionId})")).AsString();
 
+    /// <summary>Which character-width table that pane was opened with.</summary>
+    public string UnicodeAtOpen(uint sessionId) =>
+        engine.Evaluate(string.Create(CultureInfo.InvariantCulture, $"unicodeAtOpen({sessionId})")).AsString();
+
+    /// <summary>Whether that pane loaded the Unicode 11 addon.</summary>
+    public bool HasUnicode11(uint sessionId) =>
+        engine.Evaluate(string.Create(CultureInfo.InvariantCulture, $"hasUnicode11({sessionId})")).AsBoolean();
+
     /// <summary>How many times that session's pane has been asked for the caret.</summary>
     public int Focuses(uint sessionId) =>
         (int)engine.Evaluate(string.Create(CultureInfo.InvariantCulture, $"focuses({sessionId})")).AsNumber();