Hi,

I made a patch, based on Jan Hendrik Farr's fakefullscreen patch, to make a 
specific application fake a full screen via Rules.

It helps me a lot having just a specific application, like a web browser, fake 
a full screen so I can watch a video while waiting, thought about sending in 
case somebody else finds it useful.

Thanks,

Francisco
From 524ac2f4bc0a741cc6b1c43aa2e1b6bff2a57088 Mon Sep 17 00:00:00 2001
From: Francisco Tapia <[email protected]>
Date: Wed, 13 May 2020 15:47:16 -0500
Subject: [PATCH] Selective fake full screen

---
 config.def.h |  6 +++---
 dwm.c        | 26 +++++++++++++++++++-------
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/config.def.h b/config.def.h
index 1c0b587..b7a445b 100644
--- a/config.def.h
+++ b/config.def.h
@@ -26,9 +26,9 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class      instance    title       tags mask     isfloating   monitor */
-	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
-	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
+	/* class      instance    title       tags mask     isfloating   isfakefullscreen monitor */
+	{ "Gimp",     NULL,       NULL,       0,            1,           0,               -1 },
+	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           1,               -1 },
 };
 
 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index 9fd0286..acc11db 100644
--- a/dwm.c
+++ b/dwm.c
@@ -92,7 +92,7 @@ struct Client {
 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 	int bw, oldbw;
 	unsigned int tags;
-	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
+	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isfakefullscreen;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -138,6 +138,7 @@ typedef struct {
 	const char *title;
 	unsigned int tags;
 	int isfloating;
+	int isfakefullscreen;
 	int monitor;
 } Rule;
 
@@ -299,6 +300,7 @@ applyrules(Client *c)
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
 			c->isfloating = r->isfloating;
+			c->isfakefullscreen = r->isfakefullscreen;
 			c->tags |= r->tags;
 			for (m = mons; m && m->num != r->monitor; m = m->next);
 			if (m)
@@ -522,7 +524,8 @@ clientmessage(XEvent *e)
 		if (cme->data.l[1] == netatom[NetWMFullscreen]
 		|| cme->data.l[2] == netatom[NetWMFullscreen])
 			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
-				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
+				      || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */
+                                      && (!c->isfullscreen || c->isfakefullscreen))));
 	} else if (cme->message_type == netatom[NetActiveWindow]) {
 		if (c != selmon->sel && !c->isurgent)
 			seturgent(c, 1);
@@ -566,7 +569,8 @@ configurenotify(XEvent *e)
 			updatebars();
 			for (m = mons; m; m = m->next) {
 				for (c = m->clients; c; c = c->next)
-					if (c->isfullscreen)
+					if (c->isfullscreen
+                                        &&  !c->isfakefullscreen)
 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 			}
@@ -1144,7 +1148,8 @@ movemouse(const Arg *arg)
 
 	if (!(c = selmon->sel))
 		return;
-	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
+	if (c->isfullscreen
+	&&  !c->isfakefullscreen) /* no support moving fullscreen windows by mouse */
 		return;
 	restack(selmon);
 	ocx = c->x;
@@ -1299,7 +1304,8 @@ resizemouse(const Arg *arg)
 
 	if (!(c = selmon->sel))
 		return;
-	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
+	if (c->isfullscreen
+	&&  !c->isfakefullscreen) /* no support resizing fullscreen windows by mouse */
 		return;
 	restack(selmon);
 	ocx = c->x;
@@ -1477,6 +1483,8 @@ setfullscreen(Client *c, int fullscreen)
 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
 		c->isfullscreen = 1;
+                if (c->isfakefullscreen)
+                        return;
 		c->oldstate = c->isfloating;
 		c->oldbw = c->bw;
 		c->bw = 0;
@@ -1487,6 +1495,8 @@ setfullscreen(Client *c, int fullscreen)
 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
 			PropModeReplace, (unsigned char*)0, 0);
 		c->isfullscreen = 0;
+                if (c->isfakefullscreen)
+                        return;
 		c->isfloating = c->oldstate;
 		c->bw = c->oldbw;
 		c->x = c->oldx;
@@ -1619,7 +1629,8 @@ showhide(Client *c)
 	if (ISVISIBLE(c)) {
 		/* show clients top down */
 		XMoveWindow(dpy, c->win, c->x, c->y);
-		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
+		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
+                &&  (!c->isfullscreen || c->isfakefullscreen))
 			resize(c, c->x, c->y, c->w, c->h, 0);
 		showhide(c->snext);
 	} else {
@@ -1713,7 +1724,8 @@ togglefloating(const Arg *arg)
 {
 	if (!selmon->sel)
 		return;
-	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
+	if (selmon->sel->isfullscreen
+	&&  !selmon->sel->isfakefullscreen) /* no support for fullscreen windows */
 		return;
 	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
 	if (selmon->sel->isfloating)
-- 
2.20.1

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