Delete text messages

Two devices A B with Release Candidate installed and running, set up with the following Phone Numbers and Names:
- 55501 TestA
- 55502 TestB
Ensure that the peer list (Serval main screen → Contacts → List Phones On The Mesh) on each device shows the other device
- If not, then the test case Peer list shows all nearby Batphones should also fail, which is the correct place to attach a full diagnostic report
Send a message from device A to device B and a reply back to A by following all the steps in test case Reply to text message
Ensure that devices A and B both now display the message thread showing Hello from device A to B and reply World from device B to A

ASSERT Device A shows message thread with 55502 TestB at top left and Delete button at top right
On device A, press the Delete button
ASSERT Device A pops up a dialog Do you want to delete this entire thread? with buttons OK and Cancel
On device A, press OK button
ASSERT Device A returns to Serval Mesh Messages screen
ASSERT Device A does not display any entry for 55502 TestB
On device B, enter the word Again in the text field and press Send button
Wait a few seconds
ASSERT Device A sounds a notification
ASSERT Device A now displays an entry for 55502 TestB on the Serval Mesh Messages screen
On device A, press the 55502 TestB entry
ASSERT Device A displays message thread with 55502 TestB at top left, Delete button at top right, and a single Again message inside text bubble at lower right

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