Description:
When a checkbox is relative to a cell, not to the page by default, the program crash when we want to save the sheet and the spreadsheet.

The problem is reproductible with a new spreadsheet.

Steps to Reproduce:
1. create a new file
2. Insert a new checkbox
3. Modify relative to page to relative to cell
4  Modify the size of a column
5 Save the file

Actual Results:
Crash of software.

Expected Results:
Crah of the software


Reproducible: Always


User Profile Reset: No



Additional Info:
Tested with Debien buster.
Tested with Distro Antix.
Not tested with windows.

Open Gl on Debian is :
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: llvmpipe (LLVM 7.0, 256 bits)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 18.3.6
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.1 Mesa 18.3.6
OpenGL shading language version string: 1.40
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 18.3.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions: