> When you delete all output, does that actually delete the physical
> images in the cell directory?  (You may not know, but someone can check).

Not only does it not remove the physical images e.g. sage0.png, it
doesn't even remove the cell directories!!!  My current worksheet only
has cells 4, 8, 9, 12, 14, and 15 (none of which have images, just
function definitions) and yet there are directories for cells 10, 13,
16, and 17 as well, three of which have sage0.png (which is just a
small graph of x^3).  Oddly, cells 1, 2, 3, etc. are not there, which
is somewhat comforting.  But this is after opening and closing this
worksheet (and saving it, etc.) a number of times.

Okay, I just checked this specifically.  I added a graph in a cell,
then deleted that cell, saved the worksheet, trashed the worksheet.
(I did not empty the trash!)  And the result:

$ ls -l 15/
total 32
-rw-r--r--   <snip>  14328 Feb  4 12:06 sage0.png

I even cp'ed it to my Desktop and it loads in at a hefty 16 KB.  And
even after deleting the cell, the sws goes from 133 KB to 146 KB.
This could add up REALLY fast with intense graphics.

Thanks for any tracking down of this; I definitely consider this a
bug.

- kcrisman
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