From d942b5c4d0f94dbf010696e385729f34e6e4b3a6 Mon Sep 17 00:00:00 2001
From: pierre <pierre.curto@gmail.com>
Date: Thu, 24 Dec 2020 10:32:51 +0100
Subject: [PATCH] layout.List: reduce allocations when scrolling backward

Signed-off-by: pierre <pierre.curto@gmail.com>
---
 layout/list.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/layout/list.go b/layout/list.go
index 4463e0a0..133db4b0 100644
--- a/layout/list.go
+++ b/layout/list.go
@@ -184,7 +184,9 @@ func (l *List) end(dims Dimensions, call op.CallOp) {
 	case iterateForward:
 		l.children = append(l.children, child)
 	case iterateBackward:
-		l.children = append([]scrollChild{child}, l.children...)
+		l.children = append(l.children, scrollChild{})
+		copy(l.children[1:], l.children)
+		l.children[0] = child
 		l.Position.First--
 		l.Position.Offset += mainSize
 	default: