[bug #66568] document whether find's -execdir option is guaranteed to produce pathnames that start with ./

Update of bug #66568 (group findutils):

                  Status:               Confirmed => Fixed
           Fixed Release:                    None => 4.11.0

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Follow-up Comment #3:

Thanks - pushed with some minor tweaks, e.g. the commit message shall state
which files have been touched.
I also pushed two other minor changes:

* [PATCH 3/3] doc: state that -execdir prepends the base names with "./"
  https://git.sv.gnu.org/cgit/findutils.git/commit/?id=a78812c62e7

* [PATCH 2/3] doc: maint: break lines at sentences in a paragraph to change
  https://git.sv.gnu.org/cgit/findutils.git/commit/?id=1da19bdba76

* [PATCH 1/3] maint: fix typo in comment
  https://git.sv.gnu.org/cgit/findutils.git/commit/?id=00e82f2c15f

> Just out of curiosity, why does it handle `/` specially?

Good question.

Searching in the git history, this was added (and later only modified) in
commit [1]
back in 2005.  The intention was to use suffix "./" unless for absolute file
names.

[1] https://git.sv.gnu.org/cgit/findutils.git/commit/?id=74a750b11fba

Then in 2010, there was then the change in commit [2] as a fix for  for bug
#27563
(-L breaking -execdir).  That changed slightly the logic, as it first applies
base_name(), and then checks whether the result is starting with "/" or not.
Obviously, that is then only true for the root directory "/".

[2] https://git.sv.gnu.org/cgit/findutils.git/commit/?id=e1d0a991e96e

Maybe James would remember why exempting the root directory from
prefixing with "./" would be useful.  Looking at this test file,
there was a bug report for exactly "/" as starting point:

https://git.sv.gnu.org/cgit/findutils.git/tree/find/testsuite/find.gnu/execdir-root-only.exp?h=v4.10.0


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