From 0b8fc2742b9b559c4607202f5e6a79166a2b60d0 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Mon, 25 Mar 2019 03:55:12 +0100
Subject: [PATCH] inccommand: Disable K_EVENT during preview calculation

'inccommand' invokes ex_substitute() to build its "preview". During the
brief (~millisecond) time it takes to execute that function, the buffer
is "dirty" (its contents are invalid). Events must not be handled during
this time, else they would see a temporary state which is not the true,
logical state of the buffer.

ref #9777
---
 src/nvim/ex_cmds.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index af92a9c846..150e13efd5 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -6392,6 +6392,7 @@ void ex_substitute(exarg_T *eap)
   }
 
   block_autocmds();           // Disable events during command preview.
+  input_disable_events();
 
   char_u *save_eap = eap->arg;
   garray_T save_view;
@@ -6434,6 +6435,7 @@ void ex_substitute(exarg_T *eap)
   restore_search_patterns();
   win_size_restore(&save_view);
   ga_clear(&save_view);
+  input_enable_events();
   unblock_autocmds();
 }