Make fuzzy links practical

[Rudolf Adamkovič]

Hello everyone!

Given a fuzzy link [[word]], Org by default searches for a headline "*
word".  If no such headline exists, Org asks the user if they wish to
create one.  Then, the user can also set

`org-link-search-must-match-exact-headline'

to nil, in which case, Org will search the buffer for a case-folded
"word", such as "word" or "Word".

I find this *almost* practical because, in the Org world, we normally
write headlines in either sentence case or title case, with the first
word capitalized.  But currently, if I have the text

> * Aneuploid
>
> An [[organism]] with a [[chromosomal abnormality]] regarding the
> number of [[chromosome]]s.  Includes [[monosomic]] and [[trisomic]]
> individuals.

the target headlines must appear in lowercase, such as

* chromosomal abnormality

instead in the common form

* Chromosomal abnormality

Based on my research, it seems that Org has changed how fuzzy links
match headlines, case sensitively or insensitively, multiple times.

To make fuzzy links more practical, we have more options, including:

1. case-fold headlines by default, optimizing for the common use case
2. add `'case-fold' to `org-link-search-must-match-exact-headline'
3. obey `case-fold-search' option set by the user

What do you folks think?

Rudy
-- 
"Thinking is a momentary dismissal of irrelevancies."
-- Richard Buckminster Fuller, 1969

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia