The order should be:
XDG_CONFIG_HOME/nvim
XDG_DATA_HOME/nvim/site/pack/foo/start/bar/
XDG_CONFIG_HOME/nvim/after
XDG_DATA_HOME/nvim/site/pack/foo/start/bar/after
Now remove the addition of "start/*" packages in 'packpath' as
explicit items in 'runtimepath'. This avoids 'runtimepath' from becoming
very long when using a lot of plugins as packages.
To get the effective search path as a list, use |nvim_list_runtime_paths()|
ftdetect files in start packages are sourced once from the :runtime
command in filetype.vim and once when packages are loaded. Change the
package loading logic to only source ftdetect files for opt packages to
avoid this duplication.
