Description:
When installed as a Snap, the default save location in Libreoffice Writer is "~/snap/libreoffice/XXX". I have first-hand experience of this being a severe usability problem. 

Case study:

- User is new to Linux and installs Libreoffice as a Snap alongside version from repositories. 
- User saves document in Snap Libreoffice to the default location.
- User uninstalls Snap version of Libreoffice.
- User's documents are deleted.

Although this may not sound serious ("who would not save to ~/Documents?"), the reality is that Libreoffice is one the programs that inexperienced Linux users are most likely to try. These users are unfamiliar with how the Snap packaging system works.

I suggest that Libreoffice chooses "~" as its default save location, or perhaps "~/Documents" if it exists.

Steps to Reproduce:
1. Open Libreoffice Writer (freshly installed via Snap) on Linux.
2. Press "Ctrl"+"S".
3. View default save location.

Actual Results:
Default save location is "~/snap/libreoffice/XXX".

Expected Results:
Default save location should be home ("~"), or perhaps "~/Documents" if it exists.


Reproducible: Always


User Profile Reset: No



Additional Info:
Only applies when Libreoffice is installed as a Snap.