Your system information

• Steam client version (build number or date): steam-manjaro: 1.0.0.68-1
• Distribution (e.g. Ubuntu): Manjaro 20.2
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

Adding a non-steam game to the library resulted in a malformed entry. The path to the binary had a whitespace inside which was parsed as several entities(target property and launch options) instead of one folder path.

For example: /home/username/Games/SuperGame 2/binary.exe
Should result in an entry with
Target property: "/home/username/Games/SuperGame 2/binary.exe"
Launch options:

What happens instead:
Target property: "/home/username/Games/SuperGame"
Launch options: 2/binary.exe

Steps for reproducing this issue:

1. Create a folder with whitespace and move a binary inside
2. Add this binary via steam non-steam addition
3. Right click properties of link entity