[Evolution] What is "Caret Mode"?

[Eric Lambart <ximian nomeaning net>]

Hi, sorry if this has been discussed but I couldn't find any list
messages with "caret" in the subject, and just searched the Evolution
Help, too.

My question is: What is the purpose of the "Caret Mode" in Evolution
1.5.7?  Toggleable with F7 or via View->Message Display->Caret Mode, I
can't figure out what it does.

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