Custom editor icons cannot normally be placed within an addon

[fifflesniffle]

When adding a custom FGD for an addon I'm working on with its own icon, when specifying the icon file as editor/whatever.vmt, the file would still be missing in Hammer.
I ended up getting it to work by doing ../../p2ce/addons/addon-name/hammer/editor/whatever.vmt, but a dev advised I make an issue. Additionally, $basetexture in the VMT also had to be set to the same thing (minus the .vmt at the end). It works and can be shared to the GitHub Repo and still work for others, but it's honestly not ideal.
I'm like 98% sure that the FGD thing was that Source is just set to assume that the hammer folder will always be in the root game directory, but since addons and AngelScript are both main selling points for Strata, I feel like the engine should look for a hammer/ directory within addons too. I'm not sure why the VMT for an iconsprite is assuming the hammer/ folder is in the root directory though.
A dev advised me to make an issue suggesting to change this, so here I am.

[TeamSpen210]

hammer/ is mounted in gameinfo.txt, so it's a root directory yes like p2ce. Your addon should also be a root though - is it enabled in the addon manager for Hammer? Can you see it in Hammer's texture browser?

[fifflesniffle]

yes! the addon is mounded in hammer, but it doesn't show up in the browser unless i put the icon it in the root hammer/ folder or have that long path going to the addon's hammer/ folder

[TeamSpen210]

Is it in addons/addon-name/materials/editor/whatever.vmt? That's where it should be, editor sprites are just materials like any other.

[fifflesniffle]

that was not where it was. i changed it to that and it fixed the problem- thanks!