Previously we did not check the ID in the replace tag against the ID of the last message from that JID because some MUC components change the message ID. In case the ID of the last message and the ID in the replace tag do not match, the message is simply treated as a normal message. Test-Information: Added unit tests to verify the new behavior and adjusted existing test cases for new behavior. Added test cases to ChatsManagerTest.cpp that test verification of replacement IDs for 1-to-1 chats and test non-verification of replacement IDs for MUC. All tests pass on OS X 10.11.6. Change-Id: I85b1d2138b056b445a663f3ee3ab89a56cef4a2a