applied Peter Hartlichs nice interim Xinerama and map fix patches, for debugging purposes I also added his transient test driver

LICENSE

@@ -1,16 +1,17 @@
 MIT/X Consortium License
 
 © 2006-2011 Anselm R Garbe <anselm@garbe.us>
-© 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
+© 2007-2011 Peter Hartlich <sgkkr at hartlich dot com>
+© 2010-2011 Connor Lane Smith <cls@lubutu.com>
 © 2006-2009 Jukka Salmi <jukka at salmi dot ch>
 © 2007-2009 Premysl Hruby <dfenze at gmail dot com>
 © 2007-2009 Szabolcs Nagy <nszabolcs at gmail dot com>
 © 2007-2009 Christof Musik <christof at sendfax dot de>
+© 2009 Mate Nagy <mnagy at port70 dot net>
 © 2007-2008 Enno Gottox Boland <gottox at s01 dot de>
-© 2007-2008 Peter Hartlich <sgkkr at hartlich dot com>
 © 2008 Martin Hurton <martin dot hurton at gmail dot com>
 © 2008 Neale Pickett <neale dot woozle dot org>
-© 2009 Mate Nagy <mnagy at port70 dot net>
+© 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),

dwm.c

@@ -389,7 +389,6 @@ arrange(Monitor *m) {
 		showhide(m->stack);
 	else for(m = mons; m; m = m->next)
 		showhide(m->stack);
-	focus(NULL);
 	if(m)
 		arrangemon(m);
 	else for(m = mons; m; m = m->next)
@@ -598,6 +597,7 @@ configurenotify(XEvent *e) {
 			updatebars();
 			for(m = mons; m; m = m->next)
 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
+			focus(NULL);
 			arrange(NULL);
 		}
 	}
@@ -1154,9 +1154,13 @@ manage(Window w, XWindowAttributes *wa) {
 	attach(c);
 	attachstack(c);
 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
-	XMapWindow(dpy, c->win);
 	setclientstate(c, NormalState);
+	if (c->mon == selmon)
+		unfocus(selmon->sel, False);
+	c->mon->sel = c;
 	arrange(c->mon);
+	XMapWindow(dpy, c->win);
+	focus(NULL);
 }
 
 void
@@ -1621,6 +1625,7 @@ void
 tag(const Arg *arg) {
 	if(selmon->sel && arg->ui & TAGMASK) {
 		selmon->sel->tags = arg->ui & TAGMASK;
+		focus(NULL);
 		arrange(selmon);
 	}
 }
@@ -1701,6 +1706,7 @@ toggletag(const Arg *arg) {
 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
 	if(newtags) {
 		selmon->sel->tags = newtags;
+		focus(NULL);
 		arrange(selmon);
 	}
 }
@@ -1711,6 +1717,7 @@ toggleview(const Arg *arg) {
 
 	if(newtagset) {
 		selmon->tagset[selmon->seltags] = newtagset;
+		focus(NULL);
 		arrange(selmon);
 	}
 }
@@ -1976,6 +1983,7 @@ view(const Arg *arg) {
 	selmon->seltags ^= 1; /* toggle sel tagset */
 	if(arg->ui & TAGMASK)
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
+	focus(NULL);
 	arrange(selmon);
 }
 

transient.c

@@ -0,0 +1,42 @@
+/* cc transient.c -o transient -lX11 */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+int main(void) {
+	Display *d;
+	Window r, f, t = None;
+	XSizeHints h;
+	XEvent e;
+
+	d = XOpenDisplay(NULL);
+	if (!d)
+		exit(1);
+	r = DefaultRootWindow(d);
+
+	f = XCreateSimpleWindow(d, r, 100, 100, 400, 400, 0, 0, 0);
+	h.min_width = h.max_width = h.min_height = h.max_height = 400;
+	h.flags = PMinSize | PMaxSize;
+	XSetWMNormalHints(d, f, &h);
+	XStoreName(d, f, "floating");
+	XMapWindow(d, f);
+
+	XSelectInput(d, f, ExposureMask);
+	while (1) {
+		XNextEvent(d, &e);
+
+		if (t == None) {
+			sleep(5);
+			t = XCreateSimpleWindow(d, r, 50, 50, 100, 100, 0, 0, 0);
+			XSetTransientForHint(d, t, f);
+			XStoreName(d, t, "transient");
+			XMapWindow(d, t);
+			XSelectInput(d, t, ExposureMask);
+		}
+	}
+
+	XCloseDisplay(d);
+	exit(0);
+}