bug#24175: artist mode rectangle shows ugly in Emacs

[Dean Chen]

Hi, 

  I am trying draw rectangle today in Emacs with artist mode. It looks weird, see following screenshot.

  But if I open this text file with chromium browser instead of emacs, it looks normally. I guess the way that Emacs render this rectangle has a bug.

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My OS is archlinux, Emacs version is 24.5.1. My laptop is Dell XPS 13 and display resolution is 1920 * 1080.

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Best Regards!

Dean Chen

+86 18652581062
GraphSQL Inc.