gtk3.22: gtk_container_remove: assertion 'GTK_IS_CONTAINER (container)' failed
This seems to happen when one has editor mode active when quitting the client. Even gtk2-client on S3_0 gives equivalent error.
https://www.hostedredmine.com/issues/678976 might have relevant information. While the error message is different (from older gtk+ version?), it happens on GTK_CONTAINER() cast.
Patches for all branches, including S2_6, attached.
When one has used editor mode in gtk3.22-client, console has "gtk_container_remove: assertion 'GTK_IS_CONTAINER (container)' failed"