Uploading an image with the cursor in the middle of a sentence adds span tags

[aforcier]

A parsing error happens when uploading images while in the middle of a word or sentence, causing the progress bar not to display. After the upload completes, everything looks normal, but there's a hidden span tag before the image tag, which gets uploaded with the post.

<span id="img_container_1471735653839" class="img_container"></span>

Confirmed not to be an autocorrect issue, found on a 5.0 emulator and 6.0.1 device.