Problem description: 
When drawing a line into a spreadsheet _and_ anchoring this line to the cell (not the page as is default), this line does not stay at this place when saving, closing and reopening the document.


Steps to reproduce:
1. Start a new spreadsheet
2. draw a line from one cell to another
3. change anchoring of this line to "Cell" (instead of "page")
4. Save
5. Close
6. Reopen
7. Try finding your line. If your lucky it's still on the page, up in the left upper corner. But sometimes they are even entirely gone.


Current behavior:
Line does not stay anchored to cell after save/close.

Expected behavior:
Line or any drawing object marked as "anchored to cell" should stay where it is after saving,closing.


              
Operating System: Linux (Other)
Version: 4.1.2.3 rc