A Drawing-object can be given a name.  If that name is changed, the internal
"document-changed" flag is not set, and so the "save" icon remains grey.

To reproduce:
File/New/Drawing
with the mouse, select "filled rectangle" from the drawing toolbar,
and drag to place a rectangle anywhere on the page.
File/SaveAs  junk.sxd.
Select the rectangle, right-click 'Name Object'
Give it an arbitrary name, eg myrect. Click OK.
The "save" icon remains grey, showing that OOO believes the drawing has not been
modified since the save.

This may be related to 29536 ?

(This is important to me because I use these object names a lot.
I use OOO Draw as a graphical layout tool for other applications, decoding the 
resulting sxd, and using the object names and coordinates to trigger database
inserts.)