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-rw-r--r--src/nvim/ex_cmds.c7
-rw-r--r--src/nvim/testdir/test_substitute.vim13
2 files changed, 20 insertions, 0 deletions
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index 73e6e4a62f..7f929eec3e 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -4069,11 +4069,16 @@ static int do_sub(exarg_T *eap, proftime_T timeout, long cmdpreview_ns, handle_T
// Save flags for recursion. They can change for e.g.
// :s/^/\=execute("s#^##gn")
subflags_T subflags_save = subflags;
+
+ // Disallow changing text or switching window in an expression.
+ textlock++;
// get length of substitution part
sublen = vim_regsub_multi(&regmatch,
sub_firstlnum - regmatch.startpos[0].lnum,
(char_u *)sub, (char_u *)sub_firstline, 0,
REGSUB_BACKSLASH | (p_magic ? REGSUB_MAGIC : 0));
+ textlock--;
+
// If getting the substitute string caused an error, don't do
// the replacement.
// Don't keep flags set by a recursive call
@@ -4111,10 +4116,12 @@ static int do_sub(exarg_T *eap, proftime_T timeout, long cmdpreview_ns, handle_T
int start_col = new_end - new_start;
current_match.start.col = start_col;
+ textlock++;
(void)vim_regsub_multi(&regmatch,
sub_firstlnum - regmatch.startpos[0].lnum,
(char_u *)sub, (char_u *)new_end, sublen,
REGSUB_COPY | REGSUB_BACKSLASH | (p_magic ? REGSUB_MAGIC : 0));
+ textlock--;
sub_nsubs++;
did_sub = true;
diff --git a/src/nvim/testdir/test_substitute.vim b/src/nvim/testdir/test_substitute.vim
index c45f1e7ec6..2c24ce436f 100644
--- a/src/nvim/testdir/test_substitute.vim
+++ b/src/nvim/testdir/test_substitute.vim
@@ -838,6 +838,19 @@ func Test_using_old_sub()
set nocompatible
endfunc
+" This was switching windows in between computing the length and using it.
+func Test_sub_change_window()
+ silent! lfile
+ sil! norm o0000000000000000000000000000000000000000000000000000
+ func Repl()
+ lopen
+ endfunc
+ silent! s/\%')/\=Repl()
+ bwipe!
+ bwipe!
+ delfunc Repl
+endfunc
+
" Test for the 2-letter and 3-letter :substitute commands
func Test_substitute_short_cmd()
new