Support for case sensitivity in variable names

[Former user]

Originally reported on Google Code with ID 23

I tried to use SpeedCrunch to calculate the final result in physics
problems, but since there could easily be both small t and capital T or
small m and capital M in one formula it is now impossible to first define
all the variables and then use them in the final formula since defining M
overwrites value of m for instance.

Reported by voxiac on 2007-01-31 15:36:23

[Former user]

``` I would rather have submitted this issue as enhancement, but I can't figure out where I had to specify that ```

Reported by `voxiac` on 2007-01-31 15:39:51

[Former user]

``` Hi voxiac,

Thanks for the idea.

As for enhancement, just chane Type-Defect in the label to Type-Enhancement (which I'm doing right now) ```

Reported by `ariya.hidayat` on 2007-02-03 22:23:00 - Labels added: Type-Enhancement - Labels removed: Type-Defect

[Former user]

``` I agree, variable names should be case sensitive. Accepting the sugestion, thank you. ```

Reported by `helder.pereira.correia` on 2007-05-12 01:14:03 - Status changed: `Accepted`

[Former user]

``` Fixed in trunk, will be available in 0.8 ```

Reported by `helder.pereira.correia` on 2007-05-13 01:49:50 - Status changed: `Fixed` - Labels added: Milestone-0.8

[Former user]

``` Just noticed only one of the variables is stored in the settings and loaded back from history. I'll fix this later, marking as Started. ```

Reported by `helder.pereira.correia` on 2007-05-13 02:01:10 - Status changed: `Started`

[Former user]

``` In trunk, it is now possible to define variables "x" and "X", for instance. It is also possible to define variables "PI", "Pi", "ANS", Ans" and so on. Only "pi" and "ans" are reserved now. The only remaining issue happens when saving the settings: if variables "a" and "A" are defined, only one of them is going to be saved. For portability reasons, keys cannot be case sensitive since Windows registry is not. So we would have to take another path on this. I'll leave it like this for now, since it allows to use case sensitive variables in a session, and that was the issue. Marking as "Fixed" and creating a new issue regarding the saving to settings problem. ```

Reported by `helder.pereira.correia` on 2007-05-13 21:49:38 - Status changed: `Fixed`