Dear Maintainer,

After upgrading my system to versions 4:26.04.3-7 of the messagelib
libraries, KMail/Kontact exits when ever I close the message composer.
First I observed this when sending a message, but it actually happens
even after
  - start kmail
  - click "New Message"
  - close the new message window
kmail then closes completely, but no crash handler is opened

when starting kmail from the commandline the last output lines are

```
free(): invalid next size (normal)
*** KMail got signal 6 (Exiting)
*** Dead letters dumped.
Alarm clock                kmail
```

Based on this observations I downgraded all the binaries from
messagelib to 4:26.04.3-2. And this fixed the problem.

(so I can not guarantee that the affected binary package is really
messagecomposer6 but this is the most likely culprit.)

Thanks for your work!

Nicola

Hi Nicola,

Am Mittwoch, 26. August 2026, 10:38:26 Mitteleuropäische Sommerzeit
schrieb Nicola Chiapolini:
[...]
[...]
https://tracker.debian.org/pkg/ktextaddons

Unfortunately, the library is a bit of mess as upstream does not care
about backwards compatibility and stuff just breaks left and right out of
the blue. It's also quite difficult to express this in dependencies.

The new version of ktextaddons 2.1.2 will migrate to testing in a couple
of days and should fix things. You can either downgrade messagelib or
install the respective packages from ktextaddons from unstable.

Thanks Patrick

I just upgraded my messaglib packages again and installed
libkf6textaddonswidgets1 and libktextaddons-data from unstable.

This fixed the problem as well - as you said it would.

best wishes
Nicola