vim-patch:9.0.0479: in :def function all closures in loop get the sam… (#20220)

vim-patch:9.0.0479: in :def function all closures in loop get the same variables

Problem:    In a :def function all closures in a loop get the same variables.
Solution:   Use a separate list of variables for LOADOUTER and SAVEOUTER.
1aea184a0d

(note: patch description is wrong)

src/nvim/testdir/test_filetype.vim

@@ -594,6 +594,7 @@ let s:filename_checks = {
     \ 'usw2kagtlog': ['usw2kagt.log', 'USW2KAGT.LOG', 'usw2kagt.file.log', 'USW2KAGT.FILE.LOG', 'file.usw2kagt.log', 'FILE.USW2KAGT.LOG'],
     \ 'vala': ['file.vala'],
     \ 'vb': ['file.sba', 'file.vb', 'file.vbs', 'file.dsm', 'file.ctl'],
+    \ 'vdf': ['file.vdf'],
     \ 'vdmpp': ['file.vpp', 'file.vdmpp'],
     \ 'vdmrt': ['file.vdmrt'],
     \ 'vdmsl': ['file.vdm', 'file.vdmsl'],