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FcConfigRealFilename() follows symlinks, but the link may be relative to the directory containing the link. For example, on my system, I have this file: /etc/fonts/conf.d/99-language-selector-zh.conf -> ../conf.avail/99-language-selector-zh.conf Since /etc/fonts/conf.d is probably not in PATH, open()ing the file would fail. This change makes FcConfigRealFilename() return the canonicalized filename instead. So for the example above, it would return: /etc/fonts/conf.avail/99-language-selector-zh.conf This was causing bad font rendering in Chromium [1] after the regression I introduced in 7ad010e8. [1] https://bugs.chromium.org/p/chromium/issues/detail?id=857511
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