added viewall to mainstream (only Ross Mohns version, not the toggle)

config.arg.h

@@ -48,6 +48,7 @@ static Key key[] = { \
 	{ MODKEY,			XK_2,		view,		{ .i = 1 } }, \
 	{ MODKEY,			XK_3,		view,		{ .i = 2 } }, \
 	{ MODKEY,			XK_4,		view,		{ .i = 3 } }, \
+	{ MODKEY,			XK_a,		viewall,	{ 0 } }, \
 	{ MODKEY|ControlMask,		XK_1,		toggleview,	{ .i = 0 } }, \
 	{ MODKEY|ControlMask,		XK_2,		toggleview,	{ .i = 1 } }, \
 	{ MODKEY|ControlMask,		XK_3,		toggleview,	{ .i = 2 } }, \

config.default.h

@@ -46,6 +46,7 @@ static Key key[] = { \
 	{ MODKEY,			XK_3,		view,		{ .i = 2 } }, \
 	{ MODKEY,			XK_4,		view,		{ .i = 3 } }, \
 	{ MODKEY,			XK_5,		view,		{ .i = 4 } }, \
+	{ MODKEY,			XK_a,		viewall,	{ 0 } }, \
 	{ MODKEY|ControlMask,		XK_1,		toggleview,	{ .i = 0 } }, \
 	{ MODKEY|ControlMask,		XK_2,		toggleview,	{ .i = 1 } }, \
 	{ MODKEY|ControlMask,		XK_3,		toggleview,	{ .i = 2 } }, \

dwm.1

@@ -112,6 +112,10 @@ mode (affects
 View all windows with
 .BR "tag n" .
 .TP
+.B Mod1-a
+View all windows with any
+.BR "tag" .
+.TP
 .B Mod1-Control-[0..n]
 Add/remove all windows with
 .B tag n

dwm.h

@@ -137,4 +137,5 @@ extern void restack();
 extern void togglemode(Arg *arg);
 extern void toggleview(Arg *arg);
 extern void view(Arg *arg);
+extern void viewall(Arg *arg);
 extern void zoom(Arg *arg);

view.c

@@ -273,6 +273,16 @@ view(Arg *arg)
 	arrange(NULL);
 }
 
+void
+viewall(Arg *arg)
+{
+	unsigned int i;
+
+	for(i = 0; i < ntags; i++)
+		seltag[i] = True;
+	arrange(NULL);
+}
+
 void
 zoom(Arg *arg)
 {