Subject: summary line format option %U affects faces update

From: Alexey Veretennikov <[email-masked]>
Date: Wed, 06 Jan 2016 13:45:13 +0100

The default value of gnus-summary-line-format is "%U%R%z%I%(%[%4L:
%-23,23f%]%) %s\n".
When one remove %U from the this value, i.e. uses "%R%z%I%(%[%4L:
%-23,23f%]%) %s\n",
the Gnus stops to update the face of read article in the summary buffer
when the article is read with 'space'
See the animated gif attached.

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-- 
Br,
/Alexey