ofSystemTextBoxDialog: Capturing "Cancel" with pre-populated values

[sqrtof5]

When using ofSystemTextBoxDialog with a pre-populated input field, there is no way to know that the "Cancel" option has been chosen if the pre-populated value is a valid answer.

Typical use is something like:

string userInputText = ofSystemTextBoxDialog("Question?", "Pre-populated valid answer, not identifiable placeholder");
//check userInputText value

The issue is that in this simple case, userInputText will hold the pre-populated answer even if Cancel is selected (by implementation in ofSystemUtils.cpp).

I wonder if that could be addressed, maybe by returning an empty string?
E.g. (OSX):

text = ( returnCode == NSAlertFirstButtonReturn ) ? [[label stringValue] UTF8String] : "";

Or maybe there's another way to handle these (admittedly edge) cases?

[ofTheo]

The empty string approach seems like a good way.
It should probably only be the repopulated text if the person hits the okay button.

We could also switch the return type to a custom type which contains the string and also the button that was hit, but this might be an overly complex way to handle it.