Some GTK methods documented as:
The caller of the function takes ownership of the data, and is responsible for freeing it.
It means I must use g_object_ref and g_object_unref in my app.
But what about gtkmm - as understand, it may do this automatically, but not sure.
Well, I found this gtkmm documentation page:
https://gnome.pages.gitlab.gnome.org/gtkmm-documentation/chapter-memory.html
Much of the reference documentation of glibmm and gtkmm is automatically “translated”
from C to C++. The “translation” is far from intelligent. You can usually
ignore what’s said about ownership. Where the gtkmm/glibmm documentation says
NULL or nullptr, it often means “an empty string” or “an empty Glib::RefPtr”.
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