Not reading TeX notation for both sub/supscript properly

[NSoiffer]

Description

The TeX notation for including both sub and super scripts is x_i^n or x^n_i. MathLive will use the later when generating TeX from an expression, but doesn't read it properly, resulting in super/supscript added to the whole expression

Steps to Reproduce

To get the right notation to show up, I need to do the following when typing to MathLive:

1. Type x_i
2. Select the expression (with the mouse, shift-arrow doesn't work, but that's a different issue)
3. Type ^n

Actual behavior

Now the notation looks right as pictured below:

If I copy it out, I get x^n_i. The result of pasting it in is shown below:

Copying that back out is x^n_i (i.e, the same as before).

[rpdiss]

@arnog any progress on this seems to be high priority i can be wrong ; p