Updates to support writing to new Notepad on Windows 11

src/Serilog.Sinks.Notepad/Sinks/Notepad/Interop/NotepadTextWriter.cs

@@ -94,8 +94,11 @@ public override void Flush()
                 // Get how many characters are in the Notepad editor after putting in new text
                 var textLengthAfter = User32.SendMessage(_currentNotepadEditorHandle, User32.WM_GETTEXTLENGTH, IntPtr.Zero, IntPtr.Zero);
 
+                // Determine if the write succeeded. This will break the loop.
+                succeeded = textLengthAfter != textLength;
+
                 // If no change in the text length, reset editor handle to try to find it again.
-                if (textLengthAfter == textLength)
+                if (!succeeded)
                 {
                     _currentNotepadEditorHandle = IntPtr.Zero;
                     attempts++;