patch 9.1.0161: expand() removes slash after env variable that ends with colon

Commit: 
https://github.com/vim/vim/commit/13a014452a7a020a119ac555a690c65b41f3126d
Author: zeertzjq <zeert...@outlook.com>
Date:   Sat Mar 9 17:44:46 2024 +0100

    patch 9.1.0161: expand() removes slash after env variable that ends with 
colon
    
    Problem:  expand() removes a slash after an environment variable that
              ends with a colon on Windows.
    Solution: Check the correct char for a colon (zeertzjq)
    
    closes: #14161
    
    Note: Vim still removes the path-separator at the end, if another path 
separator
    follows directly after it, e.g. on:
    
    ```
        echo $FOO='/usr/'
        echo expand('$FOO/bar') == '/usr/bar'
    ```
    
    see:
    
    ,----[ misc1.c:1630 ]
    |   // if var[] ends in a path separator and tail[] starts
    |   // with it, skip a character
    |   if (after_pathsep(dst, dst + c)
    | #if defined(BACKSLASH_IN_FILENAME) || defined(AMIGA)
    |         && (dst == save_dst || dst[-1] != ':')
    | #endif
    |         && vim_ispathsep(*tail))
    |       ++tail;
    `----
    
    Signed-off-by: zeertzjq <zeert...@outlook.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/misc1.c b/src/misc1.c
index bf70e3847..3085fc77f 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -1404,9 +1404,6 @@ expand_env_esc(
     int                mustfree;       // var was allocated, need to free it 
later
     int                at_start = TRUE; // at start of a name
     int                startstr_len = 0;
-#if defined(BACKSLASH_IN_FILENAME) || defined(AMIGA)
-    char_u     *save_dst = dst;
-#endif
 
     if (startstr != NULL)
        startstr_len = (int)STRLEN(startstr);
@@ -1631,7 +1628,7 @@ expand_env_esc(
                // with it, skip a character
                if (after_pathsep(dst, dst + c)
 #if defined(BACKSLASH_IN_FILENAME) || defined(AMIGA)
-                       && (dst == save_dst || dst[-1] != ':')
+                       && dst[c - 1] != ':'
 #endif
                        && vim_ispathsep(*tail))
                    ++tail;
diff --git a/src/testdir/test_expand.vim b/src/testdir/test_expand.vim
index d7c393a04..bebe13868 100644
--- a/src/testdir/test_expand.vim
+++ b/src/testdir/test_expand.vim
@@ -51,6 +51,19 @@ func Test_expand_tilde_filename()
   bwipe!
 endfunc
 
+func Test_expand_env_pathsep()
+  let $FOO = './foo'
+  call assert_equal('./foo/bar', expand('$FOO/bar'))
+  let $FOO = './foo/'
+  call assert_equal('./foo/bar', expand('$FOO/bar'))
+  let $FOO = 'C:'
+  call assert_equal('C:/bar', expand('$FOO/bar'))
+  let $FOO = 'C:/'
+  call assert_equal('C:/bar', expand('$FOO/bar'))
+
+  unlet $FOO
+endfunc
+
 func Test_expandcmd()
   let $FOO = 'Test'
   call assert_equal('e x/Test/y', expandcmd('e x/$FOO/y'))
diff --git a/src/version.c b/src/version.c
index 507c4591a..8f28596f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    161,
 /**/
     160,
 /**/

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