--the new approach does not load/unload layouts
during startup/exit. When the user loads layouts
in multiple layouts mode the layouts are inserted
and when exit they still remain in the hidden
multiple layouts file. These layouts present in the
multiple layouts file from now are called preloaded
layouts.
--the new approach fixes also the wayland exit
issue and in general the message for Latte not
closed properly has been totally dropped.
BUG:448702
BUG:446205