Asking about math issue

Hi guys!

I was looking at this old issue in math. I can reproduce this behavior, and
it maybe be simple to fix:
https://bugs.freedesktop.org/show_bug.cgi?id=32062

So, my idea:
If we have the formula selected, and we insert a new unary operator
operator(+- , -+, ¬, +, -) we will prepend the current formula with the new
unary operator.

Else If we don't have anything selected, just add the unary operator.

Else // if we have text selected
replace the formula with the new operator

What you guys think?

If you agree, I'll ask for code pointers to make this works :)

Thanks since now!

-- 
Att,

Marcos Paulo de Souza
Acadêmico de Ciencia da Computação - FURB - SC
Github: https://github.com/marcosps/
"Uma vida sem desafios é uma vida sem razão"
"A life without challenges, is a non reason life"