https://bugzilla.gnome.org/show_bug.cgi?id=654751
* required.
*
* Note that events and messages share the same sequence number incrementor;
- * two events or messages will never not have the same sequence number unless
+ * two events or messages will never have the same sequence number unless
* that correspondence was made explicitly.
*
* Returns: The event's sequence number.
* it is not required.
*
* Note that events and messages share the same sequence number incrementor;
- * two events or messages will never not have the same sequence number unless
+ * two events or messages will never have the same sequence number unless
* that correspondence was made explicitly.
*
* Returns: The message's sequence number.