From cb574f415486adff645ce384979bfecf27f5be8c Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Fri, 25 Jan 2019 22:29:57 +0100
Subject: patch 8.1.0822: peeking and flushing output slows down execution

Problem:    Peeking and flushing output slows down execution.
Solution:   Do not update the mode message when global_busy is set.  Do not
            flush when only peeking for a character. (Ken Takata)
---
 src/edit.c           |  2 +-
 src/getchar.c        |  5 +++--
 src/proto/screen.pro |  1 +
 src/screen.c         | 32 ++++++++++++++++++++++----------
 src/version.c        |  2 ++
 5 files changed, 29 insertions(+), 13 deletions(-)

(limited to 'src')

diff --git a/src/edit.c b/src/edit.c
index 92dbf4cb5..f797d7f04 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -8722,7 +8722,7 @@ ins_esc(
      */
     if (reg_recording != 0 || restart_edit != NUL)
 	showmode();
-    else if (p_smd)
+    else if (p_smd && !skip_showmode())
 	msg("");
 
     return TRUE;	    /* exit Insert mode */
diff --git a/src/getchar.c b/src/getchar.c
index ff1b06b02..fe74dbfa1 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -3039,9 +3039,10 @@ inchar(
 
 	/*
 	 * Always flush the output characters when getting input characters
-	 * from the user.
+	 * from the user and not just peeking.
 	 */
-	out_flush();
+	if (wait_time == -1L || wait_time > 10L)
+	    out_flush();
 
 	/*
 	 * Fill up to a third of the buffer, because each character may be
diff --git a/src/proto/screen.pro b/src/proto/screen.pro
index b78796e74..0657831db 100644
--- a/src/proto/screen.pro
+++ b/src/proto/screen.pro
@@ -49,6 +49,7 @@ int win_ins_lines(win_T *wp, int row, int line_count, int invalid, int mayclear)
 int win_del_lines(win_T *wp, int row, int line_count, int invalid, int mayclear, int clear_attr);
 int screen_ins_lines(int off, int row, int line_count, int end, int clear_attr, win_T *wp);
 int screen_del_lines(int off, int row, int line_count, int end, int force, int clear_attr, win_T *wp);
+int skip_showmode(void);
 int showmode(void);
 void unshowmode(int force);
 void clearmode(void);
diff --git a/src/screen.c b/src/screen.c
index a80e8de65..9cdbf16b0 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -10109,6 +10109,26 @@ screen_del_lines(
     return OK;
 }
 
+/*
+ * Return TRUE when postponing displaying the mode message: when not redrawing
+ * or inside a mapping.
+ */
+    int
+skip_showmode()
+{
+    // Call char_avail() only when we are going to show something, because it
+    // takes a bit of time.  redrawing() may also call char_avail_avail().
+    if (global_busy
+	    || msg_silent != 0
+	    || !redrawing()
+	    || (char_avail() && !KeyTyped))
+    {
+	redraw_cmdline = TRUE;		// show mode later
+	return TRUE;
+    }
+    return FALSE;
+}
+
 /*
  * Show the current mode and ruler.
  *
@@ -10135,16 +10155,8 @@ showmode(void)
 		|| VIsual_active));
     if (do_mode || reg_recording != 0)
     {
-	/*
-	 * Don't show mode right now, when not redrawing or inside a mapping.
-	 * Call char_avail() only when we are going to show something, because
-	 * it takes a bit of time.
-	 */
-	if (!redrawing() || (char_avail() && !KeyTyped) || msg_silent != 0)
-	{
-	    redraw_cmdline = TRUE;		/* show mode later */
-	    return 0;
-	}
+	if (skip_showmode())
+	    return 0;		// show mode later
 
 	nwr_save = need_wait_return;
 
diff --git a/src/version.c b/src/version.c
index ad2f5e7a7..4d7730cf5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -787,6 +787,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    822,
 /**/
     821,
 /**/
-- 
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