Allow absolute path for Icon key in .desktop entries

[d8a-base]

According to the Desktop Entry Specification: If the name is an absolute path, the given file will be used.

This seems to currently not work with jgmenu.

[johanmalm]

Are you sure?
I just created a ~/.local/share/applications/foo.desktop with Icon=/some/absolute/path
I just tried it with jgmenu_run apps to check that the third field contains the absolute path? It does.
I then found some random icon and set Icon= to that and ran jgmenu_run apps | jgmenu --simple. It shows it icons I specified.
Can you provide more details?
Maybe post your desktop file
Can you post ls -la /path/to/your/icon/foo.png

[d8a-base]

Huh. You're right. I guess I jumped to conclusions. There's something else going on.

jgmenu_run apps indeed does show the absolute path.

In hindsight I think I left out some important information. Every .desktop entry that doesn't show its icon (except for one) was created by the Heroic Games Launcher.

Here's an example:

[Desktop Entry]
Name=DEMON'S TILT
Exec=xdg-open heroic://launch/b8b37813c5634dbdac61d88ff411135c
Terminal=false
Type=Application
MimeType=x-scheme-handler/heroic;
Icon=/home/d8a/.config/heroic/icons/b8b37813c5634dbdac61d88ff411135c.jpg
Categories=Game;

I don't want to jump to conclusions again but my current guess is that the file format is the culprit here... they're all a .jpg

The one that wasn't created by the Heroic Games Launcher points to an .ico file.