Closing a tab with unsaved changes ignores auto close

[Swan-Burdsly]

Environment

• Linux Mint 22.3 Cinnamon
• xed 3.8.9

Problem

When "Close window when closing last tab" is enabled, but the last tab has unsaved changes, selecting "Close without Saving" or "Save As..." closes the tab without closing the window.

Steps to reproduce

1. Go to Edit > Preferences > Editor > Auto close
2. Enable "Close window when closing last tab"
3. Open a file in xed
4. Make any change
5. Close the tab
6. Select "Close without Saving" or "Save As..."
7. Save the file (if applicable)

When the tab closes, the window stays open.

Expected behavior

When the tab closes, the window should close with it.

Additional info

Closing a tab without unsaved changes makes the window close automatically, as intended.