[PATCH] accept-line: add ZLE_KEEPSUFFIX to preserve completion suffixes

[Dimitry Grebenyuk <dimitrygrebenyuk@xxxxxxxxxx>]

From d05437f3c79616be6fdda800d4b38fdc8ddcf9bc Mon Sep 17 00:00:00 2001
From: Dimitry Grebenyuk <46931822+grebenyyk@xxxxxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 4 Apr 2026 15:20:20 +0800
Subject: [PATCH] accept-line: add ZLE_KEEPSUFFIX to preserve completion
 suffixes

When a completion adds a removable suffix (e.g. '/' after a directory
name), the accept-line widget removes it before execution because it
lacks the ZLE_KEEPSUFFIX flag. This causes a mismatch between what is
displayed on screen and what is actually executed.

To reproduce:
  mkdir -p .ssh
  source .ss<TAB>   # completes to 'source .ssh/'
  <Enter>           # executes 'source .ssh' (no slash)

The trailing '/' is visually present but stripped by removesuffix()
in execzlefunc() before the line buffer is returned for execution.

Fix this by adding ZLE_KEEPSUFFIX to accept-line, accept-and-hold,
and accept-line-and-down-history. This causes fixsuffix() to commit
the suffix permanently rather than removesuffix() stripping it.

This is consistent with accept-and-menu-complete which already has
ZLE_KEEPSUFFIX.
---
 Src/Zle/iwidgets.list   |  6 +++---
 Test/Y01completion.ztst | 10 ++++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Src/Zle/iwidgets.list b/Src/Zle/iwidgets.list
index c95c7a491..fbc962c2a 100644
--- a/Src/Zle/iwidgets.list
+++ b/Src/Zle/iwidgets.list
@@ -8,11 +8,11 @@
 # `#' starts a comment.  Blank lines are ignored.
 #
 
-"accept-and-hold", acceptandhold, 0
+"accept-and-hold", acceptandhold, ZLE_KEEPSUFFIX
 "accept-and-infer-next-history", acceptandinfernexthistory, 0
 "accept-and-menu-complete", acceptandmenucomplete, ZLE_MENUCMP | ZLE_KEEPSUFFIX
-"accept-line", acceptline, 0
-"accept-line-and-down-history", acceptlineanddownhistory, 0
+"accept-line", acceptline, ZLE_KEEPSUFFIX
+"accept-line-and-down-history", acceptlineanddownhistory, ZLE_KEEPSUFFIX
 "accept-search", NULL, 0
 "argument-base", argumentbase, ZLE_MENUCMP | ZLE_KEEPSUFFIX | ZLE_LASTCOL | ZLE_NOTCOMMAND
 "auto-suffix-remove", handlesuffix, ZLE_NOTCOMMAND
diff --git a/Test/Y01completion.ztst b/Test/Y01completion.ztst
index d7215f381..f1a2c042e 100644
--- a/Test/Y01completion.ztst
+++ b/Test/Y01completion.ztst
@@ -394,6 +394,16 @@ F:regression test workers/31611
 >NO:{z}
 
 
+  zpty -n -w zsh $': dir1\t\C-X'
+  zpty -r -m zsh log "*<WIDGET><finish>*<PROMPT>*" || {
+    print "failed to invoke finish widget."
+    return 1
+  }
+  print -lr "${(@)${(@ps:\r\n:)log##*<WIDGET><finish>}[2,-2]}"
+0:accept-line preserves completion suffix (directory slash)
+>BUFFER: : dir1/
+>CURSOR: 7
+
 %clean
 
   zmodload -ui zsh/zpty
-- 
2.53.0