Addresses multiplied after screen orientation change

[xhajt03]

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

K-9 Mail

App version

14.0

Where did you get the app from?

F-Droid

Android version

11

Device model

FxTec Pro1X (QX1050)

Steps to reproduce

1. Have automated screen orientation enabled on the device.
2. Have Cc: and BCc: fields always enabled in K9 Settings.
3. Have a default address for BCc: configured K9 Settings (for the used identity)
4. Start writing a new e-mail in portrait mode.
5. Fill in some address to the Cc: field and click to a different field
6. (Optional: Delete the predefined value in BCc:)
7. Rotate the device to the landscape mode.
8. Rotate the device back to the portrait mode.

Expected behavior

The Cc: and BCc: fields contain exactly what was filled in to them independently from screen orientation changes.

Actual behavior

Logs

No response

[mohitsatr]

I can confirm this is happening for both Cc and Bcc fields.

easiest way to reproduce:

1. Have Cc: and BCc: fields always enabled in Settings.
2. Fill in an address in either the Cc: or Bcc: field
3. Rotate the device

Please check:
Cc: https://github.com/user-attachments/assets/09a119f3-4bf7-4e2b-80b3-f436aad82195
Bcc: https://github.com/user-attachments/assets/4093957f-85fc-49d9-800b-51eb7b2298eb

[farukgdev]

I can reproduce this on current main (eb99188) and on Thunderbird Beta 16.0b3.
This happens on configuration changes (e.g. screen rotation, theme change).

• To: recipients get duplicated when To field has focus during the configuration change.
• Cc/Bcc: recipients get duplicated even if those fields don't have focus.

I'm going to work on a fix and will open a PR