SDL: Add new virtual joysticks to the end of the list

SDL Commits
1 
From 1f2a241688fe890845809008a5f4bd6fff8c4dbf Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 16 May 2022 09:02:35 -0700
Subject: [PATCH] Add new virtual joysticks to the end of the list

This guarantees that the device index that's returned is stable, as long as no joystick hotplug events occur.
---
 src/joystick/virtual/SDL_virtualjoystick.c | 12 ++++++++++--
 test/testgamecontroller.c                  |  2 +-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/joystick/virtual/SDL_virtualjoystick.c b/src/joystick/virtual/SDL_virtualjoystick.c
index b557d0c6767..c54d2730751 100644
--- a/src/joystick/virtual/SDL_virtualjoystick.c
+++ b/src/joystick/virtual/SDL_virtualjoystick.c
@@ -245,8 +245,16 @@ SDL_JoystickAttachVirtualInner(const SDL_VirtualJoystickDesc *desc)
     hwdata->instance_id = SDL_GetNextJoystickInstanceID();
 
     /* Add virtual joystick to SDL-global lists */
-    hwdata->next = g_VJoys;
-    g_VJoys = hwdata;
+    if (g_VJoys) {
+        joystick_hwdata *last;
+
+        for (last = g_VJoys; last->next; last = last->next) {
+            continue;
+        }
+        last->next = hwdata;
+    } else {
+        g_VJoys = hwdata;
+    }
     SDL_PrivateJoystickAdded(hwdata->instance_id);
 
     /* Return the new virtual-device's index */
diff --git a/test/testgamecontroller.c b/test/testgamecontroller.c
index 45560c5da79..6ccf3b66150 100644
--- a/test/testgamecontroller.c
+++ b/test/testgamecontroller.c
@@ -365,7 +365,7 @@ static void CloseVirtualController()
 {
     int i;
 
-    for (i = 0; i < SDL_NumJoysticks(); ++i) {
+    for (i = SDL_NumJoysticks(); i--; ) {
         if (SDL_JoystickIsVirtual(i)) {
             SDL_JoystickDetachVirtual(i);
         }