Description:
Currently, LOffice memorises the fonts used in a document and compiles them in a list that is above the list of unused fonts

But this memorisation does not extend beyond one session. If you close and open the document - the will be no such list

I suggest making a list of all fonts in a document that is above the list of unused fonts, so the user can conveniently pick between them 

I hope I explained well. Ask me if not clear

Steps to Reproduce:
1.Open a document
2.Write in several fonts
3.Close the document
4. Open it

Actual Results:
The list of used fonts will be lost

Expected Results:
Keeping it forever


Reproducible: Always


User Profile Reset: No

Additional Info:
None