Regenerate the current summary buffer (gnus-summary-prepare).
Pull all cached articles (for the current group) into the summary buffer
(gnus-summary-insert-cached-articles).
Pull all dormant articles (for the current group) into the summary buffer
(gnus-summary-insert-dormant-articles).
Pull all ticked articles (for the current group) into the summary buffer
(gnus-summary-insert-ticked-articles).