Adds scrollback with mouse patch

config.def.h

@@ -156,8 +156,14 @@ static unsigned int defaultattr = 11;
  */
 static MouseShortcut mshortcuts[] = {
 	/* button               mask            string */
-	{ Button4,              XK_ANY_MOD,     "\031" },
-	{ Button5,              XK_ANY_MOD,     "\005" },
+	{ Button4,              XK_NO_MOD,      "\031" },
+	{ Button5,              XK_NO_MOD,      "\005" },
+};
+
+MouseKey mkeys[] = {
+	/* button               mask            function        argument */
+	{ Button4,              ShiftMask,      kscrollup,      {.i =  1} },
+	{ Button5,              ShiftMask,      kscrolldown,    {.i =  1} },
 };
 
 /* Internal keyboard shortcuts. */

st.h

@@ -76,6 +76,13 @@ typedef union {
 	const void *v;
 } Arg;
 
+typedef struct {
+	 uint b;
+	 uint mask;
+	 void (*func)(const Arg *);
+	 const Arg arg;
+} MouseKey;
+
 void die(const char *, ...);
 void redraw(void);
 void draw(void);
@@ -122,3 +129,4 @@ extern char *termname;
 extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
+extern MouseKey mkeys[];

x.c

@@ -413,6 +413,7 @@ bpress(XEvent *e)
 {
 	struct timespec now;
 	MouseShortcut *ms;
+	MouseKey *mk;
 	int snap;
 
 	if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
@@ -428,6 +429,14 @@ bpress(XEvent *e)
 		}
 	}
 
+	for (mk = mkeys; mk < mkeys + LEN(mkeys); mk++) {
+		if (e->xbutton.button == mk->b
+				&& match(mk->mask, e->xbutton.state)) {
+			mk->func(&mk->arg);
+			return;
+		}
+	}
+
 	if (e->xbutton.button == Button1) {
 		/*
 		 * If the user clicks below predefined timeouts specific