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Due to a breaking change we have to request this explicitly in Emacs 27. Earlier Emacs versions do the right thing by default. If the effect of a face does not extend to the edge of the window, then attributes such as the background color or underline cease to be used for more that the width of a single character, which is not appropriate for a face intended to highlight a complete line. See https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37774.
Welcome to mu & mu4e! Given the enormous amounts of e-mail many people gather and the importance of e-mail message in our work-flows, it's essential to quickly deal with all that mail - in particular, to instantly find that one important e-mail you need right now, and quickly file away message for later use. `mu` is a tool for dealing with e-mail messages stored in the Maildir-format. `mu`'s purpose in life is to help you to quickly find the messages you need; in addition, it allows you to view messages, extract attachments, create new maildirs, and so on. See the [mu cheatsheet] for some examples. =mu= is fully documented. After indexing your messages into a [Xapian](http://www.xapian.org)-database, you can search them using a custom query language. You can use various message fields or words in the body text to find the right messages. Built on top of `mu` are some extensions (included in this package): * mu4e: a full-featured e-mail client that runs inside emacs * mu-guile: bindings for the Guile/Scheme programming language (version 2.2 and later) `mu` is written in C and C++; `mu4e` is written in elisp, and `mu-guile` in a mix of C and Scheme. Note, `mu` is available in Linux distributions (e.g. Debian/Ubuntu and Fedora) under the name `maildir-utils`; apparently because they don't like short names.