From 0d1ef9f548011345e144b2b37565c2f9f964ea61 Mon Sep 17 00:00:00 2001
From: Bakkeby <bakkeby@gmail.com>
Date: Mon, 10 Jan 2022 12:56:49 +0100
Subject: [PATCH] Lose fullscreen on focus change

This implements a separate losefullscreen function proposed by jzbor.
---
 dwm.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/dwm.c b/dwm.c
index a96f33c..2964adb 100644
--- a/dwm.c
+++ b/dwm.c
@@ -178,6 +178,7 @@ static void grabkeys(void);
 static void incnmaster(const Arg *arg);
 static void keypress(XEvent *e);
 static void killclient(const Arg *arg);
+static void losefullscreen(Client *sel, Client *next);
 static void manage(Window w, XWindowAttributes *wa);
 static void mappingnotify(XEvent *e);
 static void maprequest(XEvent *e);
@@ -854,6 +855,7 @@ focusstack(const Arg *arg)
 					c = i;
 	}
 	if (c) {
+		losefullscreen(selmon->sel, c);
 		focus(c);
 		restack(selmon);
 	}
@@ -1018,6 +1020,15 @@ killclient(const Arg *arg)
 	}
 }
 
+void
+losefullscreen(Client *sel, Client *next)
+{
+	if (!sel || !next)
+		return;
+	if (sel->isfullscreen && ISVISIBLE(sel) && sel->mon == next->mon && !next->isfloating)
+		setfullscreen(sel, 0);
+}
+
 void
 manage(Window w, XWindowAttributes *wa)
 {
@@ -1072,8 +1083,10 @@ manage(Window w, XWindowAttributes *wa)
 		(unsigned char *) &(c->win), 1);
 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
 	setclientstate(c, NormalState);
-	if (c->mon == selmon)
+	if (c->mon == selmon) {
+		losefullscreen(selmon->sel, c);
 		unfocus(selmon->sel, 0);
+	}
 	c->mon->sel = c;
 	arrange(c->mon);
 	XMapWindow(dpy, c->win);
-- 
2.19.1