refactor(runtime): always use DIP_START when searching for runtime files

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()|

1 files changed, 10 insertions, 2 deletions

diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index 83b256e935..ffef6a6066 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -1591,7 +1591,10 @@ describe('API', function()
       eq({'a', '', 'b'}, meths.list_runtime_paths())
       meths.set_option('runtimepath', ',a,b')
       eq({'', 'a', 'b'}, meths.list_runtime_paths())
+      -- trailing , is ignored, use ,, if you really really want $CWD
       meths.set_option('runtimepath', 'a,b,')
+      eq({'a', 'b'}, meths.list_runtime_paths())
+      meths.set_option('runtimepath', 'a,b,,')
       eq({'a', 'b', ''}, meths.list_runtime_paths())
     end)
     it('truncates too long paths', function()
@@ -2012,8 +2015,13 @@ describe('API', function()
       ok(endswith(val[1], p"autoload/remote/define.vim")
          or endswith(val[1], p"autoload/remote/host.vim"))
 
-      eq({}, meths.get_runtime_file("lua", true))
-      eq({}, meths.get_runtime_file("lua/vim", true))
+      val = meths.get_runtime_file("lua", true)
+      eq(1, #val)
+      ok(endswith(val[1], p"lua"))
+
+      val = meths.get_runtime_file("lua/vim", true)
+      eq(1, #val)
+      ok(endswith(val[1], p"lua/vim"))
     end)
 
     it('can find directories', function()