vim-patch:8.2.2518: 'listchars' should be window-local

Problem:    'listchars' should be window-local.
Solution:   Make 'listchars' global-local. (Yegappan Lakshmanan, Marco Hinz,
            closes vim/vim#5206, closes vim/vim#7850)
https://github.com/vim/vim/commit/eed9d46293f0842aad0d50ff3a526f9a48b12421

Nvim already has this feature, but it implements :set listchars the same
as :setglobal listchars, which is incorrect. Vim's implementation of
:set listchars is correct: using :set listchars clears local value.

1 files changed, 15 insertions, 1 deletions

diff --git a/test/functional/options/chars_spec.lua b/test/functional/options/chars_spec.lua
index 5439ca3dba..aa54b8a04a 100644
--- a/test/functional/options/chars_spec.lua
+++ b/test/functional/options/chars_spec.lua
@@ -122,7 +122,7 @@ describe("'listchars'", function()
                                                         |
     ]])
   end)
-  it('has value local to window', function()
+  it('has window-local value', function()
     feed('i<tab><tab><tab><esc>')
     command('set list laststatus=0')
     command('setl listchars=tab:<->')
@@ -136,4 +136,18 @@ describe("'listchars'", function()
                                                         |
     ]])
   end)
+  it('using :set clears window-local value', function()
+    feed('i<tab><tab><tab><esc>')
+    command('set list laststatus=0')
+    command('setl listchars=tab:<->')
+    command('vsplit')
+    command('set listchars=tab:>-,eol:$')
+    screen:expect([[
+      >------->-------^>-------$│<------><------><------>|
+      ~                        │~                       |
+      ~                        │~                       |
+      ~                        │~                       |
+                                                        |
+    ]])
+  end)
 end)