Call GetSearchString to obtain the character sequence typed by the user while the list view has input focus. Each time the user types a character, the list view appends the character to the search string and searches for a matching item. A timeout period of less than a second is associated with each character that the user types. If the timeout period elapses before the user types another character, the incremental search string is reset. If the system finds a match, it selects the item and, if necessary, scrolls it into view. 

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