1. Stefan Saasen
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Heiko Voigt  committed b8939b2

string-list: document that string_list_insert() inserts unique strings

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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File Documentation/technical/api-string-list.txt

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 	Insert a new element to the string_list. The returned pointer can be
 	handy if you want to write something to the `util` pointer of the
-	string_list_item containing the just added string.
+	string_list_item containing the just added string. If the given
+	string already exists the insertion will be skipped and the
+	pointer to the existing item returned.
 Since this function uses xrealloc() (which die()s if it fails) if the
 list needs to grow, it is safe not to check the pointer. I.e. you may