Well, off the top of my head:
- Package is installed and unpacked automatically either via `Import` button or just by drug-n-dropping. So users don't need to know the "correct" location (or the correct folder structure).
- Packages has persistent id, meaning that the path to package content is always persistent and can be relied upon (e.g. by other packages).
- User can easily switch between packages in a single panel without needing to copy-paste script content anywhere.
- Same package can be reused in multiple panels (again, without needing to copy-paste script content).

Okay, so drag-n-drop is a neat feature. For that should it be a .zip file that has the package.json at the root level, or does it need to include the GUID folder as well? For upgrades, dropping/installing an updated package will overwrite the original contents I assume?

What if I have 5 panels ?

Somewhat related, the sample script at samples/complete/last.fm bio.js is badly rendered in such setups because the font size comes out giant even at the smallest settings.

Whereas the GdiDrawText() method uses "segoe ui" as a fallback font for missing "segoe mdl2 assets" characters, DrawString() replaces them with empty squares. Is this a limitation of DrawString(), or am I missing something?

...I'm going to assume SMP hasn't deviated from the original WSH/JSP code where font objects have to store 2 different types of WinAPI fonts internally. Those are HFONT and Gdiplus::Font.

DrawString uses Gdiplus::Font and you get Microsoft Sans Serif if the font you ask for is missing

Since that font is for symbols only, why don't you limit yourself to what is actually there?

In 1.4.1 if I set Script source as file, and then select a file everything works. But when I restart foobar my file selection has lost everything except for what appears to be fb.profilePath. So no file is selected and I get an error and am forced to reselect the file. Interestingly when I go back into the file selection dialog it does remember the full path to the file I had last selected.

Can you provide the full path to file you are trying to use?

And can you try the latest dev build and see if it has the same error?

Full path is: D:\Source\foobar2000_portable\georgia\georgia-theme.js

Still seeing the same thing in 1.4.2-dev

Hm... Still can't reproduce...
Can you try the following custom build?
https://ci.appveyor.com/api/buildjobs/dmess6a7ifkhdl12/artifacts/_result%2FWin32_Release%2Ffoo_spider_monkey_panel.fb2k-component

Does someone know if there is a foobar controller (via Web or app) which does interact in some way with custom buttons, menus, etc?
The idea is to run smp scripts while using the controller, for example to create smart playlists. I know I could create a dummy playlist, and sending things to that playlist I could check with callbacks and run scripts but... is there any other way? (somewhat built in, obviously I know I could run menu entries using cmd commands on a local network)

Have tried these but they are limited to library management, playback or streaming
https://play.google.com/store/apps/details?id=com.cav.foobar2000controller&hl=es_GT
https://play.google.com/store/apps/details?id=com.foobar2000.foobar2000
https://hyperblast.org/beefweb/api/#/

function on_main_menu(index) {
    switch (index) {
    case 1: // triggered when File>Spider Monkey Panel>1 is run
        fb.ShowPopupMessage("success");
        console.log("success");
        break;
    }
}