Upgrading Gaspar Vardanyan's scratchpad patch to the 20200510 version.

https://github.com/GasparVardanyan/dwm-scratchpad/blob/master/dwm-scratchpad-20200510-f09418b.diff

config.def.h

@@ -825,10 +825,6 @@ static const char *statuscmds[] = { "notify-send Mouse$BUTTON" };
 static char *statuscmd[] = { "/bin/sh", "-c", NULL, NULL };
 #endif // STATUSCMD_PATCH | DWMBLOCKS_PATCH
 
-#if SCRATCHPAD_ALT_1_PATCH
-static const unsigned scratchpad_mask = 1u << sizeof tags / sizeof * tags;
-#endif // SCRATCHPAD_ALT_1_PATCH
-
 static Key keys[] = {
 	/* modifier                     key            function                argument */
 	#if KEYMODES_PATCH
@@ -997,8 +993,6 @@ static Key keys[] = {
 	{ MODKEY|ShiftMask,             XK_s,          togglesticky,           {0} },
 	#endif // STICKY_PATCH
 	#if SCRATCHPAD_ALT_1_PATCH
-	{ MODKEY,                       XK_0,          view,                   {.ui = ~scratchpad_mask } },
-	{ MODKEY|ShiftMask,             XK_0,          tag,                    {.ui = ~scratchpad_mask } },
 	{ MODKEY,                       XK_minus,      scratchpad_show,        {0} },
 	{ MODKEY|ShiftMask,             XK_minus,      scratchpad_hide,        {0} },
 	{ MODKEY,                       XK_equal,      scratchpad_remove,      {0} },

dwm.c

@@ -514,7 +514,11 @@ static Window root, wmcheckwin;
 #include "patch/include.c"
 
 /* compile-time check if all tags fit into an unsigned int bit array. */
+#if SCRATCHPAD_ALT_1_PATCH
+struct NumTags { char limitexceeded[LENGTH(tags) > 30 ? -1 : 1]; };
+#else
 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
+#endif // SCRATCHPAD_ALT_1_PATCH
 
 /* function implementations */
 void
@@ -606,12 +610,17 @@ applyrules(Client *c)
 	if (c->tags & TAGMASK)                    c->tags = c->tags & TAGMASK;
 	#if SCRATCHPAD_PATCH
 	else if (c->mon->tagset[c->mon->seltags]) c->tags = c->mon->tagset[c->mon->seltags] & ~SPTAGMASK;
+	#elif SCRATCHPAD_ALT_1_PATCH
+	else if (c->tags != SCRATCHPAD_MASK && c->mon->tagset[c->mon->seltags]) c->tags = c->mon->tagset[c->mon->seltags];
 	#else
 	else if (c->mon->tagset[c->mon->seltags]) c->tags = c->mon->tagset[c->mon->seltags];
 	#endif // SCRATCHPAD_PATCH
 	else                                     c->tags = 1;
 	#elif SCRATCHPAD_PATCH
 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : (c->mon->tagset[c->mon->seltags] & ~SPTAGMASK);
+	#elif SCRATCHPAD_ALT_1_PATCH
+	if (c->tags != SCRATCHPAD_MASK)
+		c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 	#else
 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 	#endif // EMPTYVIEW_PATCH

patch/scratchpad_alt_1.c

@@ -4,7 +4,7 @@ static void scratchpad_hide ()
 {
 	if (selmon -> sel)
 	{
-		selmon -> sel -> tags = scratchpad_mask;
+		selmon -> sel -> tags = SCRATCHPAD_MASK;
 		focus(NULL);
 		arrange(selmon);
 	}
@@ -36,9 +36,9 @@ static void scratchpad_show ()
 		scratchpad_show_first ();
 	else
 	{
-		if (scratchpad_last_showed -> tags != scratchpad_mask)
+		if (scratchpad_last_showed -> tags != SCRATCHPAD_MASK)
 		{
-			scratchpad_last_showed -> tags = scratchpad_mask;
+			scratchpad_last_showed -> tags = SCRATCHPAD_MASK;
 			focus(NULL);
 			arrange(selmon);
 		}
@@ -58,7 +58,7 @@ static void scratchpad_show ()
 				}
 				else
 				{
-					if (c -> tags == scratchpad_mask)
+					if (c -> tags == SCRATCHPAD_MASK)
 					{
 						found_next = 1;
 						scratchpad_show_client (c);
@@ -83,7 +83,7 @@ static void scratchpad_show_first (void)
 {
 	for (Client * c = selmon -> clients; c != NULL; c = c -> next)
 	{
-		if (c -> tags == scratchpad_mask)
+		if (c -> tags == SCRATCHPAD_MASK)
 		{
 			scratchpad_show_client (c);
 			break;

patch/scratchpad_alt_1.h

@@ -1,3 +1,5 @@
+# define SCRATCHPAD_MASK (1u << sizeof tags / sizeof * tags)
+
 static void scratchpad_hide ();
 static _Bool scratchpad_last_showed_is_killed (void);
 static void scratchpad_remove ();