Topic Variables --------------- Now, if you select a topic, it will fold/unfold that topic, which is really neat, I think. The topic lines themselves are created according to the `gnus-topic-line-format' variable (Note: Formatting Variables). Valid elements are: `i' Indentation. `n' Topic name. `v' Visibility. `l' Level. `g' Number of groups in the topic. `a' Number of unread articles in the topic. `A' Number of unread articles in the topic and all its subtopics. Each sub-topic (and the groups in the sub-topics) will be indented with `gnus-topic-indent-level' times the topic level number of spaces. The default is 2. `gnus-topic-mode-hook' is called in topic minor mode buffers. The `gnus-topic-display-empty-topics' says whether to display even topics that have no unread articles in them. The default is `t'.
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