* mu4e/mu4e-utils.el (mu4e~fontify-cited): Use string-width.
* mu4e/mu4e-vars.el (mu4e-cited-regexp): Improve it.
* mu4e/mu4e-utils.el (mu4e~fontify-cited): remove unsused let var.
Merge pull request #387 from thierryvolpiatto/master

* mu4e: fully fix last pull request about `mu4e~fontify-cited`