no solution yet.
but here are some information.

Firstly, on calling
$("#body_field").inlineattach({ uploadUrl: Hifone.Config.uploader_url, extraParams: { _token: Hifone.Config.token }, onReceivedFile: function(file) {console.log($("#body_field").caret())}, onUploadedFile: function(e) {} })
for debugging:

$("#body_field").caret() is already pulling to the end on or before the callback onReceivedFile

Secondly,
by putting files outside the default list
["image/jpeg", "image/png", "image/jpg", "image/gif"]

the file is blocked successfully but the caret keeps in the original position.

This could deduce there are some conflicts from jquery-inlineattachment and the existing bindings.