For example, the following line indicates one thread (a context of a topic).
384 09/17(Thu)01:32 [+1: Teranishi ] wl-0.6.2
If you type / on this line, the thread is opened and it changes the appearance like following.
384 09/17(Thu)01:32 [ Teranishi ] wl-0.6.2 388 09/17(Thu)22:34 +-[ Murata san ]
(Message 388 is the replied message to the message 384.) If you type / key once again, the thread is closed. With prefix argument, / opens all children threads.
If you type [, opens all threads in summary. ] closes all threads.
Commands with the key binding that begins with t executes commands on the messages in the thread. See section Key bindings.
You can reconstruct the thread manually. In Summary, M-w
(wl-summary-save-current-message) at the corresponding message,
and C-y (wl-summary-yank-saved-message) at the new parent
message then you have the reconstructed thread.
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