When uploading a picture in a post using the «Insert image» option of the Media Panel:

...if the uploaded image is smaller than 140 x 140 px, it will be enlarged when «Preview» size is selected!  See what happens to the above screen capture if «Preview» size is selected:

Is there an easy fix for this? I would like pictures smaller than 140 x 140 px to remain untouched.

Thank you!

PS: What is the «URL» box for? (and the «Remove» button below it?)