Removing this it's not enough, due to we are going to get a 're-rendering' of the whole list of threads when receiving a SMS while edit mode due to https://github.com/fcampo/gaia/blob/568ff6a44ed3fcaed578f58a9df9c4c6135e6e6b/apps/sms/js/sms.js#L64 . The patch needs some changes in 'appendThread'. I will come with more feedback because I had a patch for it in my local branch!