Description of the need
When adding a JS file to your theme via the .info file, it's automatically added to the header (i.e. between the <head> tags of the HTML). If you instead want to add it to the footer (i.e. just before the closing <body> tag in the HTML) you need to instead add the JS via backdrop_add_js() in something like THEME_preprocess_page(), which allows you to specify 'scope' => 'footer'.
Proposed solution
It'd be nice if we could instead do something like this in the .info file:
scripts[footer][] = js/my_footer.js
That'd be much simpler and, IMO, the more expected solution.
Alternatives that have been considered
The current solution works well enough, it's just not as easy/obvious.
Additional information
Here's a question in the forum of someone expecting this functionality but finding it didn't work: https://forum.backdropcms.org/forum/how-add-custom-js-template-head-or-f...
Draft of feature description for Press Release (1 paragraph at most)
Backdrop now allows themes to add javascript files to the footer directly from the .info file.
Recent comments
No, for sure not Leaflet, those modules are fully compatible with jQuery 3. There has been some activity re removed jQuery size() method in contrib land. What you could do now...
leaflet widget stopped working
The jQuery size method has been removed in jQuery 3. See https://api.jquery.com/size/ One of your Javascript files is still using that method, and therefore it's giving a fatal error. It's...
leaflet widget stopped working
ok I think I got it. Aggregation is an option on the "other" section. But there is also an option to avoid duplicates on the filter criteria.
Parent items won't show on Leaflet Widget.