SDL: Don't send game controller touchpad or sensor events unless the application has focus

SDL Commits
1 
From d31f90d9e18f546b7f8dba7bdb1dc5493228485d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 9 Nov 2021 12:09:01 -0800
Subject: [PATCH] Don't send game controller touchpad or sensor events unless
 the application has focus

Fixes https://github.com/libsdl-org/SDL/issues/4891
---
 src/joystick/SDL_joystick.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/joystick/SDL_joystick.c b/src/joystick/SDL_joystick.c
index bbb2237285..9bc123c39e 100644
--- a/src/joystick/SDL_joystick.c
+++ b/src/joystick/SDL_joystick.c
@@ -2721,6 +2721,13 @@ int SDL_PrivateJoystickTouchpad(SDL_Joystick *joystick, int touchpad, int finger
     }
 #endif
 
+    /* We ignore events if we don't have keyboard focus, except for touch release */
+    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
+        if (event_type != SDL_CONTROLLERTOUCHPADUP) {
+            return 0;
+        }
+    }
+
     /* Update internal joystick state */
     finger_info->state = state;
     finger_info->x = x;
@@ -2750,6 +2757,11 @@ int SDL_PrivateJoystickSensor(SDL_Joystick *joystick, SDL_SensorType type, const
     int i;
     int posted = 0;
 
+    /* We ignore events if we don't have keyboard focus */
+    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
+        return 0;
+    }
+
     for (i = 0; i < joystick->nsensors; ++i) {
         SDL_JoystickSensorInfo *sensor = &joystick->sensors[i];