FAKEFULLSCREEN_PATCH takes precedence over the FAKEFULLSCREEN_CLIENT_PATCH, ref. #13

config.def.h

@@ -795,7 +795,7 @@ static Key keys[] = {
 	#if TOGGLEFULLSCREEN_PATCH
 	{ MODKEY,                       XK_y,          togglefullscreen,       {0} },
 	#endif // TOGGLEFULLSCREEN_PATCH
-	#if FAKEFULLSCREEN_CLIENT_PATCH
+	#if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
 	{ MODKEY|ShiftMask,             XK_y,          togglefakefullscreen,   {0} },
 	#endif // FAKEFULLSCREEN_CLIENT_PATCH
 	#if FULLSCREEN_PATCH

dwm.c

@@ -159,7 +159,7 @@ struct Client {
 	unsigned int switchtag;
 	#endif // SWITCHTAG_PATCH
 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
-	#if FAKEFULLSCREEN_CLIENT_PATCH
+	#if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
 	int fakefullscreen;
 	#endif // FAKEFULLSCREEN_CLIENT_PATCH
 	#if EXRESIZE_PATCH
@@ -1745,7 +1745,7 @@ focus(Client *c)
 	#if LOSEFULLSCREEN_PATCH
 	Client *at;
 	for (at = selmon->clients; at; at = at->next)
-		#if FAKEFULLSCREEN_CLIENT_PATCH
+		#if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
 		if (at != c && at->isfullscreen && !at->fakefullscreen && ISVISIBLE(at))
 			setfullscreen(at, 0);
 		#else

patch/include.c

@@ -37,7 +37,7 @@
 #if EXRESIZE_PATCH
 #include "exresize.c"
 #endif
-#if FAKEFULLSCREEN_CLIENT_PATCH
+#if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
 #include "fakefullscreenclient.c"
 #endif
 #if FOCUSADJACENTTAG_PATCH

patch/include.h

@@ -37,7 +37,7 @@
 #if EXRESIZE_PATCH
 #include "exresize.h"
 #endif
-#if FAKEFULLSCREEN_CLIENT_PATCH
+#if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
 #include "fakefullscreenclient.h"
 #endif
 #if FOCUSADJACENTTAG_PATCH

patch/togglefullscreen.c

@@ -4,7 +4,7 @@ togglefullscreen(const Arg *arg)
     if (!selmon->sel)
         return;
 
-    #if FAKEFULLSCREEN_CLIENT_PATCH
+    #if !FAKEFULLSCREEN_PATCH && FAKEFULLSCREEN_CLIENT_PATCH
     if (selmon->sel->fakefullscreen) {
     	selmon->sel->fakefullscreen = 0;
     	if (selmon->sel->isfullscreen) {

patches.def.h

@@ -172,6 +172,7 @@
 /* Only allow clients to "fullscreen" into the space currently given to them.
  * As an example, this will allow you to view a fullscreen video in your browser on
  * one half of the screen, while having the other half available for other tasks.
+ * This patch takes precedence over the fakefullscreen client patch below.
  * https://dwm.suckless.org/patches/fakefullscreen/
  */
 #define FAKEFULLSCREEN_PATCH 0