Edit > Undo remains disabled after paste or cut on newly opened sketch

[per1234]

Using Arduino IDE 1.8.14 Hourly Build 2021/30/09 09:33, Windows 10 64 bit

1. File > New - this will cause the Edit > Undo menu item to be disabled because there is no edit history.
2. Copy some text to the clipboard.
3. Paste the text to the sketch - Edit > Undo remains disabled even though a Ctrl+z will undo the paste.

This issue occurs with Arduino IDE 1.8.2 and newer, it does not occur with 1.8.1 and older.

This may be related to the DocumentChanged event issue mentioned in #6022 (comment).

Originally reported at http://forum.arduino.cc/index.php?topic=443558.msg3289844#msg3289844

[per1234]

The same issue occurs with Edit > Cut or Ctrl + X.

Originally reported at:
http://forum.arduino.cc/index.php?topic=609254.msg4136763#msg4136763