From 2116ff47eadd54fefc1dd6f7f13431feda64acb5 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 17 Apr 2022 09:44:47 +0800
Subject: [PATCH] vim-patch:8.2.0791: a second popup window with terminal
 causes trouble

Problem:    A second popup window with terminal causes trouble.
Solution:   Disallow opening a second terminal-popup window. (closes vim/vim#6101,
            closes vim/vim#6103) Avoid defaulting to an invalid line number.
https://github.com/vim/vim/commit/b5383b174b2436b556f76f14badb1c1f55d6d8f6

This is the only applicable hunk.
---
 src/nvim/ex_docmd.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index cbfe6e3789..fc0bb48803 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -2373,8 +2373,13 @@ int parse_cmd_address(exarg_T *eap, char **errormsg, bool silent)
     switch (eap->addr_type) {
     case ADDR_LINES:
     case ADDR_OTHER:
-      // default is current line number
-      eap->line2 = curwin->w_cursor.lnum;
+      // Default is the cursor line number.  Avoid using an invalid
+      // line number though.
+      if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count) {
+        eap->line2 = curbuf->b_ml.ml_line_count;
+      } else {
+        eap->line2 = curwin->w_cursor.lnum;
+      }
       break;
     case ADDR_WINDOWS:
       eap->line2 = CURRENT_WIN_NR;