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* Added -g option to shrink-path plugin.

The new optins adds an asterix to the uniquely shortened name, such
that, if copy'n'pasted, zsh globbing will expand to the full path name
of the shortened path:

shrink-path -g:
"/net/software/modules/modulefiles" -> "/n*/s*/modules/m*"

shrink-path -l -g:
"/net/software/modules/modulefiles" -> "/n*/s*/modules/modulefiles"

* Updated also the README file with the new -g option.

* shrink-path: improved handling of special cases

This commits improves the handling of special cases in path strings:

- handling of white space in path names
- handling of single-letter path names

* Update plugins/shrink-path/README.md
Co-Authored-By: Jacob Tomaw <jacob.tomaw@gmail.com>

* Fix typo "Asterix" and replace with "asterisk"

* Add optional quoting support to shrink_path
Co-authored-by: Jacob Tomaw <jacob.tomaw@gmail.com>

* Added minimum length and ellipsis symbol options for the shrink-path plugin.

* Replaced tab indentation with space indentation for the shrink-path plugin.

* Added handling of multicharacter ellipsis, and updated documentation and README for the shrink-path plugin.

* use https everywhere

* use https links on the files that are left

Also, removed some broken links and updated redirections.

Fixes #6317

This reverts commit 3dab7e46.

unset chpwd_functions before running cd to work with the path, to avoid side-effects if the user has set any chpwd_functions which cause output, such as is the case if the user is using auto-ls (#6830)

* Add shrink-path plugin to shorten directory paths (e.g. ~/f/b/quux)

* Add a README