how to clear residual garbage in a stack?

Brian Milby brian at
Tue May 22 10:21:21 EDT 2018

Did you attempt to do a “save as” on the stack? From what you described it
sounds like LC wrote the file in place but did not truncate what was there
after the EOF so extra data was there on the end. Need to try this on
Mac/Linux to see if it does the same thing.
On Tue, May 22, 2018 at 9:14 AM Neville Smythe via use-livecode <
use-livecode at> wrote:

> Hmm, excellent suggestions from Phil and Richard, but evidently something
> else is going on.
> > Use "compact stack" to get rid of space formerly used by now-deleted
> > objects.
> compact stack did not recover the 8 MB after deleting all but the first
> card from my test stack to reduce it to what should be a 28KB file.
> > Does your card contain a group with its backgroundBehavior set to true?
> >
> > If so, and if the cards are created with copy and paste, I believe you
> > may find a large number of unplaced groups in the stack.
> The extra cards were created using create, not copy-and-paste, there is
> only 1 group in the stack before and after deleting extra cards.
> Actually I just did a hex dump of the 8MB file saved from the 1 card
> stack; and lo! it has an EOF at about the 28KB position, at which point
> BBEdit stops dumping the file; up to that point it appears to be the
> correct data for a 1 card stack, no extraneous garbage. But the system
> reports it as an 8MB file. Doesn’t that mean the file was not closed
> correctly by the save stack command, or that compact stack is not working
> correctly to reduce the internal memory and save stack is blindly writing
> bytes beyond the EOF, so either way it is a bug?
> All of which is peripheral to my original aim of finding out what is going
> on with LC and Windows 10
> Neville Smythe
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