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Using Opal

Just got a feature request that pretty much can be handled already, so I just wanted to remind everyone about Opal's multiple selection.

Clicking a triangle selects it. Pretzel-clicking a second triangle adds it to the selection. Shift-clicking another triangle adds it and all visible topics in between to the selection. Or there are a number of ways to select topics with Edit > Select.

Most commands work on multiple selections (and can then be Undone if necessary). They're only performed if they make sense. For example, you may have a bunch of collapsed topics and a bunch of expanded topics in the selection. You can choose either Expand Topic or Collapse Topic.

Note that selected topics are always visible. Obviously some commands affect hidden topics (like Copy Topic or Delete Topic) -- I think these are all ones that relate to the outline structure and not to topic data.