simply, makes "foo" complete to both "barfoo" and "frodo". Add 'flex'
to 'completion-styles' or 'completion-category-overrides' to use it.
++++
+** There is a new face attribute :extend to use the face attributes to
+extend after the end of the line until the end of the window. Such
+:extend is set to nil by default in all faces except for `hl-line` and
+`region` because those extend until the end of the window by default.
+
** Connection-local variables
+++