SDL: x11: Set the skip taskbar and skip pager atoms on utility windows

SDL Commits
1 
From 078995bbe079e97251c7f75d45d797f5103c2377 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Sun, 5 Nov 2023 16:17:36 -0500
Subject: [PATCH] x11: Set the skip taskbar and skip pager atoms on utility
 windows

Some compositors apparently still need these set to keep the window out of the taskbar and pager, even with the utility window atom being set.
---
 src/video/x11/SDL_x11window.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/video/x11/SDL_x11window.c b/src/video/x11/SDL_x11window.c
index 373590ec2cf7..e17113cf25b5 100644
--- a/src/video/x11/SDL_x11window.c
+++ b/src/video/x11/SDL_x11window.c
@@ -121,6 +121,8 @@ void X11_SetNetWMState(SDL_VideoDevice *_this, Window xwindow, Uint32 flags)
     Atom _NET_WM_STATE_MAXIMIZED_HORZ = videodata->_NET_WM_STATE_MAXIMIZED_HORZ;
     Atom _NET_WM_STATE_FULLSCREEN = videodata->_NET_WM_STATE_FULLSCREEN;
     Atom _NET_WM_STATE_ABOVE = videodata->_NET_WM_STATE_ABOVE;
+    Atom _NET_WM_STATE_SKIP_TASKBAR = videodata->_NET_WM_STATE_SKIP_TASKBAR;
+    Atom _NET_WM_STATE_SKIP_PAGER = videodata->_NET_WM_STATE_SKIP_PAGER;
     Atom atoms[16];
     int count = 0;
 
@@ -136,6 +138,10 @@ void X11_SetNetWMState(SDL_VideoDevice *_this, Window xwindow, Uint32 flags)
     if (flags & SDL_WINDOW_ALWAYS_ON_TOP) {
         atoms[count++] = _NET_WM_STATE_ABOVE;
     }
+    if (flags & SDL_WINDOW_UTILITY) {
+        atoms[count++] = _NET_WM_STATE_SKIP_TASKBAR;
+        atoms[count++] = _NET_WM_STATE_SKIP_PAGER;
+    }
     if (flags & SDL_WINDOW_INPUT_FOCUS) {
         atoms[count++] = _NET_WM_STATE_FOCUSED;
     }