Save/discard changes dialog is not triggered for certain edits

[min7-i]

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Checklist

• [x] I can reproduce the bug with the latest version.
• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information to.
• [x] I have read the FAQ and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [x] This issue contains only one bug.
• [x] I have read and understood the contribution guidelines.

Describe the bug When editing an event and pressing the back button, a dialog is displayed asking if the changes should be saved or discarded. However, this dialog is missing and the changes are not saved when editing the following fields:

• time zone
• recurrence end (the other recurrence settings do trigger the dialog)
• attendees (addition, removal, attendance status)
• free/busy status

To Reproduce Steps to reproduce the behavior:

1. Open a CalDAV event.
2. Add or remove attendees.
3. Press the back button.
4. The save/discard changes dialog is not shown.

Expected behavior The dialog to save or discard the changes is shown.

Screenshots

screen recording

https://github.com/FossifyOrg/Calendar/assets/97251923/e5dc9413-3e6e-4f80-af4b-365695e18111

Device info (please complete the following information):

• Model: Google Pixel 6a
• OS: Android 14 (GrapheneOS)
• Version: 1.0.2

Additional context N/A

[min7-i]

I noticed that some other fields are affected as well. So I added them to the issue description.

[TechD123]

Wanted to add that the problem goes a bit further: when using the back button (instead of the gesture) after a calendar entry edit, the dialog never shows up and the edits aren't saved. This is kind of dangerous for critical events :P

I'd also swap the positioning of the icons for "delete" and "duplicate".