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In order to eliminate g_test_expect_message() (which doesn’t work with G_LOG_USE_STRUCTURED), make the warning about the fallback theme not existing be conditional on the icon theme search path containing a system path. Any application code which modifies the search path does so through appends and prepends, so this should not affect whether the warning is emitted in production. https://bugzilla.gnome.org/show_bug.cgi?id=769485
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