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bug#30045: X protocol error and a test case

From: Vivek Dasmohapatra
Subject: bug#30045: X protocol error and a test case
Date: Thu, 11 Jan 2018 17:03:05 +0000 (GMT)
User-agent: Alpine 2.02 (DEB 1266 2009-07-14) 
Looks like it gets triggered inside XftFontLoadGlyphs

  -> …/.libs/libXft.so.2.3.2(XftFontLoadGlyphs+0x716) [0x7f415551fd16]
  -> …/.libs/libXft.so.2.3.2(XftGlyphExtents+0x14b) [0x7f415551cf6b]
  -> [backtrace enters emacs proper]
  -> … (xftfont_text_extents)

but it would appear that the cause is that Xft can't process colour fonts
like Noto Color Emoji.

So we either have to:

  - hack on libXft until it can, and make that a requirement
  - use some other mechanism for colour fonts
  - exclude fonts like N-C-E /before/ we get to Xft so we don't crash

https://github.com/googlei18n/noto-emoji/issues/183
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