Slingshot Calc and Pantheon Calc don't agree on decimal point

[John Guerreiro]

When date/number locale is set to pt_PT:
On Slingshot:
"3.2 + 3.4" -> returns 6,6
"3,2 + 3,4" -> returns 6,6

On pantheon-calc:
"3,2 + 3,4" -> returns 6,6
"3.2 + 3.4" -> returns " '.' is unknown"

When date/number locale is set to en_UK:
On Slingshot:
"3.2 + 3.4" -> returns 6,6
"3,2 + 3,4" -> returns 6,6

On pantheon-calc:
"3,2 + 3,4" -> returns " ',' is unknown"
"3.2 + 3.4" -> returns 6.6

I understand pantheon-calc is more intelligent checking the locale setting for numbers for the proper decimal point but it seems inconsistent across the system.
I've changed around some code in pantheon-calc for it to accept both but it's more of a question of:
"Should slingshot calc respect date/number locale settings as well or should pantheon-calc accept both ',' and '.' as decimal points."

[Danielle Foré (danrabbit)]

This should probably be solved by having pantheon-calculator provide the logic for the calculator plugin to Slingshot.

In other words, Slingshot should just send the string to pantheon calculator and pantheon calculator should do the math.