is
Checks if a contact has been invited by the user.
This method verifies whether the specified contact is currently in the list of sent invitations.
Behavior:
Returns
trueif the given contact matches an existing sent invitation that is still pending.Returns
falseif no pending invitation exists for the specified contact.
Return
true if the contact has been invited and the invitation is pending, false otherwise.
Parameters
contact
The IRainbowContact to check for a pending invitation.