Copyright-holder and year information is extracted from git log.
git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
If the "Sorry I cannot do that" dialog is displayed from
FloatingTextEntry::use_text(), the entry is still visible and accepts
[focus] events. Also the dialog returns focus and multiple
idle_delete_self() will be called for an Entry that's already being
deleted.
I would have loved to split this apart, but there are just so many interrelated changes,
it makes little sense and would be a huge effort that would break future git bisect
use because so many intermediate commits would not compile
