Notifies assistive technologies of a change in contents.
Implementations of the gtk.accessible_text.AccessibleText interface should call this
function every time their contents change as the result of an operation,
like an insertion or a removal.
Note: If the change is a deletion, this function must be called *before*
removing the contents, if it is an insertion, it must be called *after*
inserting the new contents.
Notifies assistive technologies of a change in contents.
Implementations of the gtk.accessible_text.AccessibleText interface should call this function every time their contents change as the result of an operation, like an insertion or a removal.
Note: If the change is a deletion, this function must be called *before* removing the contents, if it is an insertion, it must be called *after* inserting the new contents.