[DriveSetup] replace slider with spinner

[Disreali]

It is extremely difficult to create partitions of a specific size using the slider in DriveSetup. It would be much easier with a spinner.

Depends on ticket:6834

[Disreali]

(In #6834) Replying to leavengood:

If we can find a good use for this class in a few places in Haiku, I could see it getting added faster (though like I said, probably not to the Interface Kit first.)

Tickets #8056 and #8057 were created for that reason.

Also please mark old patches obsolete when you update them.

Sorry, I've not been successful in obsoleting anything on trac.

[Disreali]

@ jscipione

Will your AbstractSpinner work for this?

[axeld]

I wouldn't go as far as replacing here, but why not add a spinner, too? Some things like "full"/"half"/"quarter" sizes are much easier made with a slider. I would even argue that you rarely need the accuracy of a spinner, even though I would like to have one there, too.

[jessicah]

There's already a text entry box. A spinner seems a rather useless addition. It should be sufficient to specify the size in the text box, as well as supporting the normal suffixes (k, M, G), etc.