found a cool site, futzed with logging

README.md

@@ -4,4 +4,5 @@
 - VT codes doc: https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences
 - Sample for ConPTY: https://github.com/Microsoft/console/tree/master/samples/ConPTY/EchoCon
 - Win32 APIs: WinBase.h, ProcessEnv.h, consoleapi.h
-- Calculating size of a textbox: https://stackoverflow.com/questions/9264398/how-to-calculate-wpf-textblock-width-for-its-known-font-size-and-characters
+- Calculating size of a textbox: https://stackoverflow.com/questions/9264398/how-to-calculate-wpf-textblock-width-for-its-known-font-size-and-characters
+- a random fun site: http://wiki.bash-hackers.org/scripting/terminalcodes

src/ConsoleBuffer/Buffer.cs

@@ -44,8 +44,9 @@ public void Append(byte[] bytes, int length)
         {
             lock (this.renderLock)
             {
-                foreach (char ch in Encoding.UTF8.GetString(bytes, 0, length))
+                for (var i = 0;i < length; ++i)
                 {
+                    var ch = (char)bytes[i];
                     if (ch == '\n')
                     {
                         Logger.Verbose($"newline (current: {this.lines[this.currentLine]})");

src/ConsoleBuffer/ConsoleWrapper.cs

@@ -130,7 +130,9 @@ private void ReadConsoleTask()
                     {
                         Logger.Verbose("reading ...");
                         var read = ptyOutput.Read(input, 0, input.Length);
-                        Logger.Verbose("appending ...");
+                        if (read == 0) continue;
+
+                        Logger.Verbose($"appending {read} bytes...");
                         this.Buffer.Append(input, read);
                         Logger.Verbose("notifying ...");
                         this.OnPropertyChanged(nameof(this.Buffer));