Subject: Bad interaction between before-string and :box faces

From: Clément Pit-Claudel <[email-masked]>
Date: Wed, 18 Mar 2020 15:26:38 -0400

Hi all,

In the following sample, the word "test" should have its letters "e" and "s" in a box; but instead they display with just a bar above and below.  Removing the before-string property fixes the issue.

(with-current-buffer (get-buffer-create "box-test")
  (erase-buffer)
  (insert "test")
  (let ((ov (make-overlay 2 4)))
    (overlay-put ov 'face '(:box t))
    (overlay-put ov 'before-string
                 (propertize ">" 'display
                             '(left-fringe right-arrow))))
  (pop-to-buffer (current-buffer)))

This was reported by Artemios (cc'd) in https://github.com/flycheck/flycheck/issues/1666.

Clément.

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