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-rw-r--r--src/nvim/ex_docmd.c5
-rw-r--r--src/nvim/testdir/test_excmd.vim8
2 files changed, 13 insertions, 0 deletions
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 52da7fe4f6..f55344e77e 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -7756,6 +7756,11 @@ static void do_exmap(exarg_T *eap, int isabbrev)
static void ex_winsize(exarg_T *eap)
{
char_u *arg = eap->arg;
+
+ if (!ascii_isdigit(*arg)) {
+ EMSG2(_(e_invarg2), arg);
+ return;
+ }
int w = getdigits_int(&arg, false, 10);
arg = skipwhite(arg);
char_u *p = arg;
diff --git a/src/nvim/testdir/test_excmd.vim b/src/nvim/testdir/test_excmd.vim
index 20508b12d3..98a3e60368 100644
--- a/src/nvim/testdir/test_excmd.vim
+++ b/src/nvim/testdir/test_excmd.vim
@@ -131,3 +131,11 @@ func Test_confirm_cmd_cancel()
\ term_getline(buf, 20))}, 1000)
call StopVimInTerminal(buf)
endfunc
+
+" Test for the :winsize command
+func Test_winsize_cmd()
+ call assert_fails('winsize 1', 'E465:')
+ call assert_fails('winsize 1 x', 'E465:')
+ call assert_fails('win_getid(1)', 'E475: Invalid argument: _getid(1)')
+ " Actually changing the window size would be flaky.
+endfunc