[swashbuck]

Fixes #3661

Fix

• With build.includes set, LESS files placed directly in a plugin's less/plugins/ folder (e.g. less/plugins/speed.less) are now compiled. Previously any path containing /less/plugins was treated as a nested plugin-specific folder, and the file was dropped silently because speed.less is not a folder named after an included plugin.
• The nested check now only applies to files inside a less/plugins/<plugin>/ subfolder, so plugin-specific styles such as vanilla's less/plugins/adapt-contrib-gmcq/ are still left out when that plugin is not included.

Testing

1. Add a .less file with a unique selector directly in an included plugin's less/plugins/ folder, e.g. src/components/adapt-contrib-media/less/plugins/test.less.
2. In config.json, set build.includes to the plugins in use, leaving out one plugin that vanilla has a less/plugins/<plugin>/ folder for (e.g. adapt-contrib-gmcq).
3. Run grunt dev and search build/adapt.css for the selectors:
   • The loose less/plugins/test.less selector is present (missing before this fix).
   • Selectors from vanilla's less/plugins/<included-plugin>/ folders are present.
   • Selectors from vanilla's less/plugins/<excluded-plugin>/ folder are absent.
4. Remove build.includes and rebuild: all of the above are present, as before.

Tested on v5.56.3.

Posted via collaboration with Claude Code