quiz.el v1.7

I wondered yesterday:

...those question headers are displaying differently, with the background colour no longer spanning the width of the window. I'd like to understand why.

Turns out it was pretty straightforward:

diff --git a/quiz.el b/quiz.el
index 2dbe45d..c1ba255 100644
--- a/quiz.el
+++ b/quiz.el
@@ -40,7 +40,8 @@
 (defface quiz-question-number-face
   '((t :height 1.3
        :background "black"
-       :foreground "white"))
+       :foreground "white"
+       :extend t))
   "Face for the question number."
   :group 'quiz)

and so v1.7 has happened.

It looks like, perhaps, at some point in the past, :extend was t by default, but it no longer is? Either way, explicitly setting it to t has done the trick.