From 7d9b901ab376a894cfe83841c878f60e03468238 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 12 Feb 2018 20:20:39 +0900
Subject: [PATCH] ui: Avoid creating empty slice at GamepadIDs

---
 internal/ui/input.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/internal/ui/input.go b/internal/ui/input.go
index 4356101fb..a160ce9f1 100644
--- a/internal/ui/input.go
+++ b/internal/ui/input.go
@@ -31,9 +31,14 @@ func (i *Input) CursorPosition() (x, y int) {
 	return adjustCursorPosition(i.cursorX, i.cursorY)
 }
 
+var emptyIDs = []int{}
+
 func (i *Input) GamepadIDs() []int {
 	i.m.RLock()
 	defer i.m.RUnlock()
+	if len(i.gamepads) == 0 {
+		return emptyIDs
+	}
 	r := []int{}
 	for id, g := range i.gamepads {
 		if g.valid {