Merge branch 'mjog/608-gtk-style-context-log-spam' into 'mainline'

Fix ConversationList GtkStyleContext log spam

Closes #608

See merge request !350

(cherry picked from commit 543c7531)

876c1076 Fix ConversationList GtkStyleContext log spam
4 jobs for cherry-pick-543c7531 in 12 minutes and 27 seconds (queued for 1 second)
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passed #479150
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00:03:30

 
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00:08:12

 
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review

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failed #479153
allowed to fail manual
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