From 27f9b1c7b029d8f61723fd261bed76ea7a01e68d Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Fri, 1 Dec 2017 04:18:34 +0100
Subject: tui: emit some termcodes later (after startup) (#7664)

For some reason, enabling focus reporting during terminal setup, causes
slow rendering during Nvim startup on tmux 2.3 with the tmux
`focus-events` option enabled.

To workaround that issue, this commit defers the request.

closes #7649

init.vim:
    call plug#begin('~/.config/nvim/plugged')
    Plug 'morhetz/gruvbox'
    call plug#end()
    set background=light " background light just to see the effect more quickly
    colorscheme gruvbox
.tmux.conf:
    set -g focus-events on
    set-option -ga terminal-overrides ",xterm-256color:Tc"
    set-option -g default-terminal "screen-256color"

Using `script` to record the terminal session (and `vterm-dump` to
post-process the result):

BEFORE this commit:
    ./build/bin/nvim -u NONE{CR}{LF}
    {DECSM 1049}{DECSM 1}{ESC =}
    {CUP *}{ED 2}{DECSM 2004}{DECSM 1004}{CSI 8,44,156 t}{CSI * r}
    {CUP 1,1}
    {CUP *}{ED 2}{DECSM 25}
    {DECRM 25}{CSI 2   q}{CSI 2   q}
    {CUP *}{ED 2}{LF}
    {ESC (B}{SGR *}{SGR 94}~                                                                                                                                                           {CR}{LF}
    ~                                                                                                                                                           {CR}{LF}

AFTER this commit:
    ./build/bin/nvim -u NONE{CR}{LF}
    {DECSM 1049}{DECSM 1}{ESC =}
    {CUP *}{ED 2}{CSI 8,44,156 t}{CSI * r}
    {CUP 1,1}
    {CUP *}{ED 2}{DECSM 2004}{DECSM 1004}{DECSM 25}
    {DECRM 25}{CSI 2   q}{CSI 2   q}
    {CUP *}{ED 2}{LF}
    {ESC (B}{SGR *}{SGR 94}~                                                                                                                                                           {CR}{LF}
    ~                                                                                                                                                           {CR}{LF}
    ...
---
 src/nvim/tui/tui.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/nvim/tui/tui.c b/src/nvim/tui/tui.c
index 56a81a1c36..9bd3364a43 100644
--- a/src/nvim/tui/tui.c
+++ b/src/nvim/tui/tui.c
@@ -167,6 +167,18 @@ static size_t unibi_pre_fmt_str(TUIData *data, unsigned int unibi_index,
   return unibi_run(str, data->params, buf, len);
 }
 
+/// Emits some termcodes after Nvim startup, which were observed to slowdown
+/// rendering during startup in tmux 2.3 (+focus-events). #7649
+static void terminfo_start_event(void **argv)
+{
+  UI *ui = argv[0];
+  TUIData *data = ui->data;
+  // Enable bracketed paste
+  unibi_out_ext(ui, data->unibi_ext.enable_bracketed_paste);
+  // Enable focus reporting
+  unibi_out_ext(ui, data->unibi_ext.enable_focus_reporting);
+}
+
 static void termname_set_event(void **argv)
 {
   char *termname = argv[0];
@@ -244,10 +256,6 @@ static void terminfo_start(UI *ui)
   unibi_out(ui, unibi_enter_ca_mode);
   unibi_out(ui, unibi_keypad_xmit);
   unibi_out(ui, unibi_clear_screen);
-  // Enable bracketed paste
-  unibi_out_ext(ui, data->unibi_ext.enable_bracketed_paste);
-  // Enable focus reporting
-  unibi_out_ext(ui, data->unibi_ext.enable_focus_reporting);
   uv_loop_init(&data->write_loop);
   if (data->out_isatty) {
     uv_tty_init(&data->write_loop, &data->output_handle.tty, data->out_fd, 0);
@@ -296,6 +304,8 @@ static void tui_terminal_start(UI *ui)
   update_size(ui);
   signal_watcher_start(&data->winch_handle, sigwinch_cb, SIGWINCH);
   term_input_start(&data->input);
+  loop_schedule_deferred(data->loop,
+                         event_create(terminfo_start_event, 1, ui));
 }
 
 static void tui_terminal_stop(UI *ui)
-- 
cgit