[BUG] Undo-ing changes in editor leads to a couple of incorrect behaviors

[SamiFawcett]

Environment (please complete the following information):

• OS: Mac OS
• Java version: openjdk 18.0.2.1 2022-08-18

Describe the bug

1. Undo-ing all changes in an unsaved file or saved file prompts a save file prompt when it shouldn't.
2. When you make a change to the file, then save that file, pressing ctrl+z to undo the last change will erase the contents of the file.

Explain Steps To Reproduce
Steps to reproduce the behavior:
For bug 1:

1. Open editor
2. Write EzAsm code
3. Undo all changes in editor
4. Exit editor

For bug 2:

1. Open saved file
2. Press ctrl+z

Expected behavior
For bug 1: The save prompt should not show when no changes have been made to the existing or non existing file (empty).
For bug 2: Ctrl+z on a reopened saved file shouldn't change the contents of the text area at all.