From 03e167dbb70fbc967e310f95200bcd63f43cac72 Mon Sep 17 00:00:00 2001
From: Raphael Robatsch <raphael-git@tapesoftware.net>
Date: Sat, 13 Nov 2021 17:22:52 +0100
Subject: [PATCH 1/2] fullscreennotify: don't crash if called before map

SDL2 calls xdg_toplevel.unset_fullscreen() before the surface is
mapped. This causes a segfault in dwl because setfullscreen() expects
the surface to be mapped already.
Therefore, delay the setfullscreen call until the surface is mapped.
---
 dwl.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/dwl.c b/dwl.c
index 6303c25..f99fc9a 100644
--- a/dwl.c
+++ b/dwl.c
@@ -1042,7 +1042,13 @@ void
 fullscreennotify(struct wl_listener *listener, void *data)
 {
 	Client *c = wl_container_of(listener, c, fullscreen);
-	setfullscreen(c, !c->isfullscreen);
+	struct wlr_xdg_toplevel_set_fullscreen_event *event = data;
+	if (!c->mon) {
+		/* if the client is not mapped yet, let mapnotify() call setfullscreen() */
+		c->isfullscreen = event->fullscreen;
+		return;
+	}
+	setfullscreen(c, event->fullscreen);
 }
 
 Monitor *
@@ -1316,6 +1322,9 @@ mapnotify(struct wl_listener *listener, void *data)
 
 	/* Set initial monitor, tags, floating status, and focus */
 	applyrules(c);
+
+	if (c->isfullscreen)
+		setfullscreen(c, 1);
 }
 
 void

From 43228bd493f53f996a645156f0505b63e79a4f72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leonardo=20Hern=C3=A1ndez=20Hern=C3=A1ndez?=
 <leohdz172@protonmail.com>
Date: Sun, 13 Mar 2022 20:54:44 -0600
Subject: [PATCH 2/2] don't use fullscreen event in fullscreennotify()

---
 client.h | 10 ++++++++++
 dwl.c    |  7 ++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/client.h b/client.h
index 56e3089..f955688 100644
--- a/client.h
+++ b/client.h
@@ -95,6 +95,16 @@ client_is_float_type(Client *c)
 	return 0;
 }
 
+static inline int
+client_wants_fullscreen(Client *c)
+{
+#ifdef XWAYLAND
+	if (client_is_x11(c))
+		return c->surface.xwayland->fullscreen;
+#endif
+	return c->surface.xdg->toplevel->requested.fullscreen;
+}
+
 static inline int
 client_is_unmanaged(Client *c)
 {
diff --git a/dwl.c b/dwl.c
index f99fc9a..612f3d7 100644
--- a/dwl.c
+++ b/dwl.c
@@ -1042,13 +1042,14 @@ void
 fullscreennotify(struct wl_listener *listener, void *data)
 {
 	Client *c = wl_container_of(listener, c, fullscreen);
-	struct wlr_xdg_toplevel_set_fullscreen_event *event = data;
+	int fullscreen = client_wants_fullscreen(c);
+
 	if (!c->mon) {
 		/* if the client is not mapped yet, let mapnotify() call setfullscreen() */
-		c->isfullscreen = event->fullscreen;
+		c->isfullscreen = fullscreen;
 		return;
 	}
-	setfullscreen(c, event->fullscreen);
+	setfullscreen(c, fullscreen);
 }
 
 Monitor *