From 138110e082e95ff82f042591c476b7479ba436e0 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Sat, 13 Apr 2019 00:37:27 -0400
Subject: [PATCH 1/2] vim-patch:8.0.0683: visual bell flashes too quickly

Problem:    When using a visual bell there is no delay, causing the flash to
            be very short, possibly unnoticeable.  Also, the flash and the
            beep can lockup the UI when repeated often.
Solution:   Do the delay in Vim or flush the output before the delay. Limit the
            bell to once per half a second. (Ozaki Kiichi, closes vim/vim#1789)
https://github.com/vim/vim/commit/2e147caa14f622dfd1c1def8e07c113b9b85d4b2
---
 src/nvim/misc1.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/nvim/misc1.c b/src/nvim/misc1.c
index 0008409731..4fc2451788 100644
--- a/src/nvim/misc1.c
+++ b/src/nvim/misc1.c
@@ -2583,10 +2583,17 @@ void vim_beep(unsigned val)
 
   if (emsg_silent == 0) {
     if (!((bo_flags & val) || (bo_flags & BO_ALL))) {
-      if (p_vb) {
-        ui_call_visual_bell();
-      } else {
-        ui_call_bell();
+      static uint64_t start_time = 0;
+
+      // Only beep once per half a second, otherwise a sequence of beeps
+      // would freeze Vim.
+      if (start_time == 0 || os_hrtime() - start_time > 500000000u) {
+        start_time = os_hrtime();
+        if (p_vb) {
+          ui_call_visual_bell();
+        } else {
+          ui_call_bell();
+        }
       }
     }
 

From 5e048baa5fd5c0d38448d9b0e3511c247ad47ec7 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Sat, 25 May 2019 11:15:24 -0400
Subject: [PATCH 2/2] Allow 3 beeps per half a second

---
 src/nvim/misc1.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/nvim/misc1.c b/src/nvim/misc1.c
index 4fc2451788..4cc6c150e0 100644
--- a/src/nvim/misc1.c
+++ b/src/nvim/misc1.c
@@ -2583,12 +2583,17 @@ void vim_beep(unsigned val)
 
   if (emsg_silent == 0) {
     if (!((bo_flags & val) || (bo_flags & BO_ALL))) {
+      static int beeps = 0;
       static uint64_t start_time = 0;
 
-      // Only beep once per half a second, otherwise a sequence of beeps
-      // would freeze Vim.
+      // Only beep up to three times per half a second,
+      // otherwise a sequence of beeps would freeze Vim.
       if (start_time == 0 || os_hrtime() - start_time > 500000000u) {
+        beeps = 0;
         start_time = os_hrtime();
+      }
+      beeps++;
+      if (beeps <= 3) {
         if (p_vb) {
           ui_call_visual_bell();
         } else {