From 71223e2db87c2bf3b09aecb46266b56cda26191d Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 30 May 2022 15:23:09 +0100
Subject: [PATCH] patch 8.2.5043: can open a cmdline window from a substitute
 expression

Problem:    Can open a cmdline window from a substitute expression.
Solution:   Disallow opening a command line window when text or buffer is
            locked.
---
 src/buffer.c                    |  7 +------
 src/ex_getln.c                  | 19 +++++++++++++++++++
 src/proto/ex_getln.pro          |  5 +++--
 src/testdir/test_substitute.vim | 25 +++++++++++++++++++++++++
 src/version.c                   |  2 ++
 src/window.c                    |  5 +----
 6 files changed, 51 insertions(+), 12 deletions(-)

Backport: Drop test case, because the expected E565 was only introduced in
 8.2.0670 and the testcase does not otherwise fail or issue messages in
 valgrind.

--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2297,12 +2297,7 @@ buflist_getfile(
     if (buf == curbuf)
 	return OK;
 
-    if (text_locked())
-    {
-	text_locked_msg();
-	return FAIL;
-    }
-    if (curbuf_locked())
+    if (text_or_buf_locked())
 	return FAIL;
 
     /* altfpos may be changed by getfile(), get it now */
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -2590,6 +2590,21 @@ get_text_locked_msg(void)
 }
 
 /*
+ * Check for text, window or buffer locked.
+ * Give an error message and return TRUE if something is locked.
+ */
+    int
+text_or_buf_locked(void)
+{
+    if (text_locked())
+    {
+	text_locked_msg();
+	return TRUE;
+    }
+    return curbuf_locked();
+}
+
+/*
  * Check if "curbuf_lock" or "allbuf_lock" is set and return TRUE when it is
  * and give an error message.
  */
@@ -7188,6 +7203,10 @@ open_cmdwin(void)
     int			save_KeyTyped;
 #endif
 
+    /* Can't do this when text or buffer is locked. */
+    if (text_or_buf_locked())
+	return K_IGNORE;
+
     /* Can't do this recursively.  Can't do it when typing a password. */
     if (cmdwin_type != 0
 # if defined(FEAT_CRYPT) || defined(FEAT_EVAL)
--- a/src/proto/ex_getln.pro
+++ b/src/proto/ex_getln.pro
@@ -5,6 +5,7 @@ char_u *getcmdline_prompt(int firstc, ch
 int text_locked(void);
 void text_locked_msg(void);
 char *get_text_locked_msg(void);
+int text_or_buf_locked(void);
 int curbuf_locked(void);
 int allbuf_locked(void);
 char_u *getexline(int c, void *cookie, int indent);
--- a/src/version.c
+++ b/src/version.c
@@ -792,6 +792,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5043,
+/**/
     805,
 /**/
     5024,
--- a/src/window.c
+++ b/src/window.c
@@ -4173,14 +4173,11 @@ win_goto(win_T *wp)
     win_T	*owp = curwin;
 #endif
 
-    if (text_locked())
+    if (text_or_buf_locked())
     {
 	beep_flush();
-	text_locked_msg();
 	return;
     }
-    if (curbuf_locked())
-	return;
 
     if (wp->w_buffer != curbuf)
 	reset_VIsual_and_resel();