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The gnus Summary Buffer can be refreshed/updated to show new articles with / N.
How can the buffer be refreshed/updated to remove messages deleted with B DEL? These remain after issuing B DEL and / N.
What you want to do is M-g I think. It will get ride of the deleted articles. This shortcut is bound to gnus-summary-rescan-group.
Basically it will exit the group, ask for new articles then select the group again.
Required, but never shown