From ca42e5e00a6ce53cf91aa2cbe946f437052b5fd1 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Thu, 13 Dec 2018 10:58:57 +0900
Subject: [PATCH] Avoid unnecessary redraw of preview window

Close #1455
---
 src/terminal.go | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/terminal.go b/src/terminal.go
index d0b2971..b99b952 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -1532,7 +1532,7 @@ func (t *Terminal) Loop() {
 	}
 
 	go func() {
-		var focused *Item
+		var focusedIndex int32 = minItem.Index()
 		var version int64 = -1
 		for {
 			t.reqBox.Wait(func(events *util.Events) {
@@ -1549,10 +1549,14 @@ func (t *Terminal) Loop() {
 						t.printInfo()
 					case reqList:
 						t.printList()
-						currentFocus := t.currentItem()
-						if currentFocus != focused || version != t.version {
+						var currentIndex int32 = minItem.Index()
+						currentItem := t.currentItem()
+						if currentItem != nil {
+							currentIndex = currentItem.Index()
+						}
+						if focusedIndex != currentIndex || version != t.version {
 							version = t.version
-							focused = currentFocus
+							focusedIndex = currentIndex
 							if t.isPreviewEnabled() {
 								_, list := t.buildPlusList(t.preview.command, false)
 								t.cancelPreview()