gio:list-store-find-with-equal-func (store item func)

store -- a g:list-store object
item -- a g:object instance
func -- a g:equal-func-full callback function

The unsigned integer with the first position of the item, if it was found, otherwise nil.

Looks up the given item in the list store by looping over the items and comparing them with the func callback function until the first occurrence of item which matches. If the item was not found, this method will return false.

Since 2.74