Try to use the fish_indent that corresponds to the fish binary

Users may install two versions of fish and configure their terminal to run
the one that is second in $PATH.  This is not really what I'd do but it
seems reasonable.  We should not need $PATH for this.

Fixes #10770

share/functions/__fish_indent.fish

@@ -0,0 +1,8 @@
+function __fish_indent
+    set -l dir "$(path dirname -- (status fish-path 2>/dev/null))"
+    if command -v $dir/fish_indent >/dev/null
+        $dir/fish_indent $argv
+    else
+        fish_indent $argv
+    end
+end

share/functions/edit_command_buffer.fish

@@ -18,7 +18,7 @@ function edit_command_buffer --description 'Edit the command buffer in an extern
     set -l editor (__fish_anyeditor)
     or return 1
 
-    set -l indented_lines (commandline -b | fish_indent --only-indent)
+    set -l indented_lines (commandline -b | __fish_indent --only-indent)
     string join -- \n $indented_lines >$f
     set -l offset (commandline --cursor)
     # compute cursor line/column
@@ -91,7 +91,7 @@ function edit_command_buffer --description 'Edit the command buffer in an extern
     $editor
 
     set -l raw_lines (command cat $f)
-    set -l unindented_lines (string join -- \n $raw_lines | fish_indent --only-unindent)
+    set -l unindented_lines (string join -- \n $raw_lines | __fish_indent --only-unindent)
 
     # Here we're checking the exit status of the editor.
     if test $status -eq 0 -a -s $f

share/functions/fish_clipboard_copy.fish

@@ -3,8 +3,8 @@ function fish_clipboard_copy
     if isatty stdin
         # Copy the current selection, or the entire commandline if that is empty.
         # Don't use `string collect -N` here - `commandline` adds a newline.
-        set cmdline (commandline --current-selection | fish_indent --only-indent | string collect)
-        test -n "$cmdline"; or set cmdline (commandline | fish_indent --only-indent | string collect)
+        set cmdline (commandline --current-selection | __fish_indent --only-indent | string collect)
+        test -n "$cmdline"; or set cmdline (commandline | __fish_indent --only-indent | string collect)
     else
         # Read from stdin
         while read -lz line

share/functions/funced.fish

@@ -47,12 +47,12 @@ function funced --description 'Edit function definition'
 
     if test "$editor" = fish
         if functions -q -- $funcname
-            functions --no-details -- $funcname | fish_indent --only-unindent | fish_indent --no-indent | read -z init
+            functions --no-details -- $funcname | __fish_indent --only-unindent | __fish_indent --no-indent | read -z init
         end
 
         set -l prompt 'printf "%s%s%s> " (set_color green) '$funcname' (set_color normal)'
         if read -p $prompt -c "$init" --shell cmd
-            echo -n $cmd | fish_indent --only-unindent | read -lz cmd
+            echo -n $cmd | __fish_indent --only-unindent | read -lz cmd
             eval "$cmd"
         end
         if set -q _flag_save