Adding zoomswap patch (pertag compatible)

patch/include.c

@@ -9,3 +9,7 @@
 #if SYSTRAY_PATCH
 #include "systray.c"
 #endif
+
+#if ZOOMSWAP_PATCH
+#include "zoomswap.c"
+#endif // ZOOMSWAP_PATCH

patch/include.h

@@ -4,4 +4,8 @@
 
 #if SYSTRAY_PATCH
 #include "systray.h"
-#endif
+#endif
+
+#if ZOOMSWAP_PATCH
+#include "zoomswap.h"
+#endif // ZOOMSWAP_PATCH

patch/pertag.c

@@ -7,5 +7,7 @@ struct Pertag {
 	#if PERTAGBAR_PATCH
 	Bool showbars[LENGTH(tags) + 1]; /* display bar for the current tag */
 	#endif // PERTAGBAR_PATCH
+	#if ZOOMSWAP_PATCH
 	Client *prevzooms[LENGTH(tags) + 1]; /* store zoom information */
+	#endif // ZOOMSWAP_PATCH
 };

patch/zoomswap.c

@@ -0,0 +1,13 @@
+
+#if !PERTAG_PATCH
+static Client *prevzoom = NULL;
+#endif // PERTAG_PATCH
+
+Client *
+prevtiled(Client *c) {
+	Client *p;
+	if (!c || c == c->mon->clients)
+		return NULL;
+	for (p = c->mon->clients; p && p->next != c; p = p->next);
+	return p;
+}

patch/zoomswap.h

@@ -0,0 +1 @@
+static Client *prevtiled(Client *c);