User can notice that opening two "new archive" windows will have inconsistent behavior - writing in the focused window actually writes in the unfocused window.

Steps :

1. Boot System
2. Start File Roller
3. Click on new archive
4. From the top bar, select again "new archive"
5. Observe you have 2 "new archive windows", one focused and one unfocused
6. Try to click on the other unfocused window, observe you can't
7. Start writing on the focused window, observe that you actually write in the unfocused one

Expected outcome

You can focus any of the 2 windows and typing in the focused one does not show test in the unfocused window

Actual outcome

Can't switch windows and text is inputted into wrong window