Description:
All options, which are inherited in child styles from parent style, are dissapear, because Draw doesn't save hierarchy of drawing styles, when you save and reopen file ODG. After reopen file all child styles move to level of parent style

Steps to Reproduce:
1. Open new Draw document
2. Create a new style with name "Parent" with your options (fill area, line, font , etc). Select on tab "Organize", Inherit from: None
3. Create a new style "Child", that will have one different option from the style "Parent" (for example, another color of fill area). Select on tab "Organize", Inherit from: "Parent"
4. Draw two figures and apply our new styles Parent and Child to each of them
5. Save file and close all open module of LibreOffice.
6. Reopen file. Figure with style "Child" changed own view, because dissapears hierarchy of styles (see both sreenshot and file from attach) 

Actual Results:  
hierarchy of drawing styles does not save if you save and reopen file

Expected Results:
hierarchy of drawing styles is stable forever


Reproducible: Always


User Profile Reset: No



Additional Info:


User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36