runtime(tcsh): Update ftplugin (#13327)

Commit: 
https://github.com/vim/vim/commit/7687238e1b0d2f26ba57e1bdf76f782eaa43af3a
Author: dkearns <[email protected]>
Date:   Sat Oct 14 20:27:27 2023 +1100

    runtime(tcsh): Update ftplugin (https://github.com/vim/vim/issues/13327)
    
    Fix b:browsefilter deletion error when calling b:undo_ftplugin.
    
    Fixes #13167
    
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/ftplugin/csh.vim b/runtime/ftplugin/csh.vim
index ca5da5a8b..2feec57bb 100644
--- a/runtime/ftplugin/csh.vim
+++ b/runtime/ftplugin/csh.vim
@@ -3,9 +3,11 @@
 " Maintainer:          Doug Kearns <[email protected]>
 " Previous Maintainer: Dan Sharp
 " Contributor:         Johannes Zellner <[email protected]>
-" Last Change:         2021 Oct 15
+" Last Change:         2023 Oct 09
 
-if exists("b:did_ftplugin") | finish | endif
+if exists("b:did_ftplugin")
+  finish
+endif
 let b:did_ftplugin = 1
 
 let s:save_cpo = &cpo
@@ -18,7 +20,7 @@ setlocal formatoptions+=crql
 
 let b:undo_ftplugin = "setlocal com< cms< fo<"
 
-" Csh:  thanks to Johannes Zellner
+" Csh: thanks to Johannes Zellner
 " - Both foreach and end must appear alone on separate lines.
 " - The words else and endif must appear at the beginning of input lines;
 "   the if must appear alone on its input line or after an else.
@@ -38,13 +40,14 @@ if exists("loaded_matchit") && !exists("b:match_words")
        \   s:line_start .. 'case\s\+:' .. s:line_start .. 
'default\>:\<breaksw\>:' ..
        \   s:line_start .. 'endsw\>'
   unlet s:line_start
-  let b:undo_ftplugin ..= " | unlet b:match_words"
+  let b:undo_ftplugin ..= " | unlet! b:match_words"
 endif
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
-  let  b:browsefilter="csh Scripts (*.csh)     *.csh
" ..
-       \             "All Files (*.*)  *.*
"
-  let b:undo_ftplugin ..= " | unlet b:browsefilter"
+  let b:browsefilter = "csh Scripts (*.csh)    *.csh
" ..
+       \              "All Files (*.*) *.*
"
+  let b:csh_set_browsefilter = 1
+  let b:undo_ftplugin ..= " | unlet! b:browsefilter b:csh_set_browsefilter"
 endif
 
 let &cpo = s:save_cpo
diff --git a/runtime/ftplugin/tcsh.vim b/runtime/ftplugin/tcsh.vim
index 85d3873b3..b2467b43a 100644
--- a/runtime/ftplugin/tcsh.vim
+++ b/runtime/ftplugin/tcsh.vim
@@ -2,9 +2,11 @@
 " Language:            tcsh
 " Maintainer:          Doug Kearns <[email protected]>
 " Previous Maintainer: Dan Sharp
-" Last Change:         2021 Oct 15
+" Last Change:         2023 Oct 09
 
-if exists("b:did_ftplugin") | finish | endif
+if exists("b:did_ftplugin")
+  finish
+endif
 
 let s:save_cpo = &cpo
 set cpo-=C
@@ -12,24 +14,26 @@ set cpo-=C
 " Define some defaults in case the included ftplugins don't set them.
 let s:undo_ftplugin = ""
 let s:browsefilter = "csh Files (*.csh)        *.csh
" ..
-           \        "All Files (*.*)   *.*
"
+      \                     "All Files (*.*)   *.*
"
 
 runtime! ftplugin/csh.vim ftplugin/csh_*.vim ftplugin/csh/*.vim
 let b:did_ftplugin = 1
 
 " Override our defaults if these were set by an included ftplugin.
 if exists("b:undo_ftplugin")
-    let s:undo_ftplugin = b:undo_ftplugin
+  let s:undo_ftplugin = b:undo_ftplugin
 endif
 if exists("b:browsefilter")
-    let s:browsefilter = b:browsefilter
+  let s:browsefilter = b:browsefilter
 endif
 
-if (has("gui_win32") || has("gui_gtk"))
-    let  b:browsefilter="tcsh Scripts (*.tcsh) *.tcsh
" .. s:browsefilter
+if (has("gui_win32") || has("gui_gtk")) &&
+      \ (!exists("b:browsefilter") || exists("b:csh_set_browsefilter"))
+  let b:browsefilter = "tcsh Scripts (*.tcsh)  *.tcsh
" .. s:browsefilter
+  let s:undo_ftplugin = "unlet! b:browsefilter | " .. s:undo_ftplugin
 endif
 
-let b:undo_ftplugin = "unlet! b:browsefilter | " .. s:undo_ftplugin
+let b:undo_ftplugin = s:undo_ftplugin
 
 let &cpo = s:save_cpo
 unlet s:save_cpo

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