From 41d414c2fc262be7ccb6572919f0c3fe6ae3338f Mon Sep 17 00:00:00 2001
From: Arun Prakash Jana <engineerarun@gmail.com>
Date: Thu, 6 May 2021 12:34:31 +0530
Subject: [PATCH] Skip a complete erase on redraw()

---
 src/nnn.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/src/nnn.c b/src/nnn.c
index 6d0b828d..0d15e802 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -5752,18 +5752,19 @@ static void redraw(char *path)
 
 	DPRINTF_S(__func__);
 
-	/* Clear screen */
-	erase();
-
-	/* Enforce scroll/cursor invariants */
-	move_cursor(cur, 1);
-
 	/* Fail redraw if < than 10 columns, context info prints 10 chars */
-	if (ncols < MIN_DISPLAY_COLS) {
+	/* Note: this should be before the Fast redraw, but we optimize */
+	if (ncols <= MIN_DISPLAY_COLS) {
+		erase();
 		printmsg(messages[MSG_FEW_COLUMNS]);
 		return;
 	}
 
+	move(0, 0);
+
+	/* Enforce scroll/cursor invariants */
+	//move_cursor(cur, 1);
+
 	//DPRINTF_D(cur);
 	DPRINTF_S(path);
 
@@ -5824,11 +5825,13 @@ static void redraw(char *path)
 
 	ncols = adjust_cols(ncols);
 
+	clrtoeol(); /* Clear to end of first line */
+
+	move(1, 0);
 	/* Go to first entry */
-	if (curscroll > 0) {
-		move(1, 0);
+	if (curscroll > 0)
 		addch('^');
-	}
+	clrtoeol(); /* Clear to end of second line */
 
 	move(2, 0);
 
@@ -5847,6 +5850,8 @@ static void redraw(char *path)
 		g_state.dircolor = 0;
 	}
 
+	clrtobot(); /* clear to end of screen */
+
 	/* Go to first entry */
 	if (i < ndents) {
 		move(xlines - 2, 0);