test: add tests for neovim#20348

Author: zeertzjq

src/nvim/cmdexpand.c

@@ -381,7 +381,7 @@ int nextwild(expand_T *xp, int type, int options, bool escape)
   return OK;
 }
 
-/// Create completion popup menu with items from 'matches'.
+/// Create completion popup menu with items from "matches".
 static int cmdline_pum_create(CmdlineInfo *ccline, expand_T *xp, char **matches, int numMatches,
                               bool showtail, bool noselect)
 {

test/functional/ui/cmdline_spec.lua

@@ -535,12 +535,40 @@ local function test_cmdline(linegrid)
         {2:långfile1                }|
                                  |
       ]],
+      cmdline = { { content = { { 'b långfile1' } }, firstc = ':', pos = 12 } },
       popupmenu = {
         anchor = { -1, 0, 2 },
         items = { { 'långfile1', '', '', '' }, { 'långfile2', '', '', '' } },
         pos = 0,
       },
-      cmdline = { { content = { { 'b långfile1' } }, firstc = ':', pos = 12 } },
+    }
+
+    feed('<Esc>')
+    command('silent %bwipe')
+
+    command('set shellslash')
+    -- position is correct when expanding environment variable #20348
+    command('silent cd test/functional/fixtures')
+    n.fn.setenv('XNDIR', 'wildpum/Xnamedir')
+    feed(':e $XNDIR/<Tab>')
+    screen:expect {
+      grid = [[
+        ^                         |
+        {1:~                        }|*3
+                                 |
+      ]],
+      cmdline = {
+        {
+          content = { { 'e wildpum/Xnamedir/XdirA/' } },
+          firstc = ':',
+          pos = 25,
+        },
+      },
+      popupmenu = {
+        anchor = { -1, 0, 19 },
+        items = { { 'XdirA/', '', '', '' }, { 'XfileA', '', '', '' } },
+        pos = 0,
+      },
     }
   end)
 

test/functional/ui/popupmenu_spec.lua

@@ -4853,7 +4853,7 @@ describe('builtin popupmenu', function()
         ]])
 
         feed('<esc>')
-        command('close')
+        command('%bwipe')
         command('set wildmode=full')
 
         -- special case: when patterns ends with "/", show menu items aligned
@@ -4866,6 +4866,18 @@ describe('builtin popupmenu', function()
           {1:~         }{n: file2          }{1:                        }|
           :e compdir/file1^                                  |
         ]])
+
+        -- position is correct when expanding environment variable #20348
+        command('cd ..')
+        fn.setenv('XNDIR', 'wildpum/Xnamedir')
+        feed('<C-U>e $XNDIR/<Tab>')
+        screen:expect([[
+                                                            |
+          {1:~                                                 }|*11
+          {1:~                  }{12: XdirA/         }{1:               }|
+          {1:~                  }{n: XfileA         }{1:               }|
+          :e wildpum/Xnamedir/XdirA/^                        |
+        ]])
       end)
     end