suggest_suffix

This function requests potential text to append to typed_text to make it more clear to the user what they will be activating by selecting this suggestion.

For example, if they start typing "gno", a potential suggested suffix might be "me.org" to create "gnome.org".

Parameters:

typed_text	The user entered text
self	a Suggestion

Returns:

Suffix to append to typed_text or null to leave it unchanged.