Copying a mathjax expression don't allow to edit it directly

How to reproduce:
* In the editor, open or create a not with some mathjax in some field
* copy the mathjax block
* paste it
* use the left-arrow

Expected result:
* The mathjax editor should open, allowing to edit the expression

Actual result:
* the cursor goes to the left of the mathjax expression, as if it was an image

Admittedly, I can still click on the image, or move to another field with tab, shift-tab, to be able to use the keyboard. So it's really low priority