Michael Kirkham wrote:
> 
>  This may not be a direct opinion as to your specific question, but both of
>  those look (IMHO) like throwbacks from the days before objects. Assuming
>  the precision change isn't an issue, why wouldn't you use...
> 
>        EntryVisibleRange(entryPtr, &first, &last);
>        objPtr = Tcl_DuplicateObj(entryPtr->scrollCmd);
>        Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewDoubleObj(first));
        ^^^^^^^^^^^^^^^^^^^^^^^^

Because the -[xy]scrollcommand is a script prefix (i.e., a string),
not a command prefix (i.e., a list).

In the vast overwhelming majority of cases, -[xy]scrollcommand
is indeed a proper list, but it's also possible to do stuff like:

    listbox .l -yscrollcommand { puts "I've been scrolled!" ; .sb set }


--Joe English

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