Thank you for the elaborated reply elextr
Lots of users close their session without closing softwares 1 by 1 and if a software does not ask for saving something, then we can expect it that what was typed in it is saved(initially this thread was not talking about a crash, just a regular session closure)
Above all if no indication of this need to close the program manually is given(here is in french, after a fresh install, the indication provided by geany regarding the use of scribble)
I understand that it is an work investment which may not a priority but I think this post install indication is wrong.