[mu4e bug] auto buffer switch to mu4e:headers in current buffer in a different frame

[lrpereira]

Describe the bug

Running two frames, A(start frame) and B.
Frame A is a normal Emacs GUI. Frame B is emacsclient -t , i.e. from terminal, with scratch buffer opened.
Upon receiving new email, mu4e is automatically switching the buffer in frame B to mu4e:headers.

This does not happen if frame A is GUI and frame B is also GUI.
Also, if in frame A, GUI window, I only start mu4e and stay in mu4e-main, and frame B is emacsclient -t, i.e. from terminal, the buffer does not switch automatically.

How to Reproduce

Frame A
Start with emacs -Q
Load minimal config to setup inbox
Run (mu4e) and (mu4e-headers-search inbox-query), which fetches full inbox

Frame B
Open a new terminal.
Run emacsclient -t
Send a test email
Wait until mu4e pulls email
Buffer in this frame switches to mu4e:headers buffer

I can reproduce this consistently.

Environment

Fedora 40
GNU Emacs 29.4, no 3rd party extensions
mu-1.12.6

[djcb]

I'm unable to reproduce.

[lrpereira]

This is odd. It reproduces every time for me.
Any tips to debug further ?