Movestack functionality

config.h

@@ -146,6 +146,8 @@ static const Key keys[] = {
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Right,       shiftclient,      {.i = +1} },
 	{ MODKEY,                    XKB_KEY_Up,          focusstack,       {.i = -1} },
 	{ MODKEY,                    XKB_KEY_Down,        focusstack,       {.i = +1} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Up,          movestack,        {.i = -1} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Down,        movestack,        {.i = +1} },
 	{ MODKEY,                    XKB_KEY_comma,       focusmon,         {.i = WLR_DIRECTION_LEFT} },
 	{ MODKEY,                    XKB_KEY_period,      focusmon,         {.i = WLR_DIRECTION_RIGHT} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Q,           quit,             {0} },

dwl.c

@@ -305,6 +305,7 @@ static void motionnotify(uint32_t time, struct wlr_input_device *device, double
 		double sy, double sx_unaccel, double sy_unaccel);
 static void motionrelative(struct wl_listener *listener, void *data);
 static void moveresize(const Arg *arg);
+static void movestack(const Arg *arg);
 static void outputmgrapply(struct wl_listener *listener, void *data);
 static void outputmgrapplyortest(struct wlr_output_configuration_v1 *config, int test);
 static void outputmgrtest(struct wl_listener *listener, void *data);
@@ -1808,6 +1809,8 @@ unset_fullscreen:
 		if (w != c && w != p && w->isfullscreen && m == w->mon && (w->tags & c->tags))
 			setfullscreen(w, 0);
 	}
+	if (c->mon)
+		focusclient(c, 1);
 }
 
 void
@@ -3099,6 +3102,38 @@ xytonode(double x, double y, struct wlr_surface **psurface,
 	if (pl) *pl = l;
 }
 
+void
+movestack(const Arg *arg)
+{
+	Client *c, *sel = focustop(selmon);
+	if (!sel || !selmon || !selmon->lt[selmon->sellt]->arrange || sel->isfloating)
+		return;
+
+	if (arg->i > 0) {
+		wl_list_for_each(c, &sel->link, link) {
+			if (&c->link == &clients)
+				continue;
+			if (VISIBLEON(c, selmon) && !c->isfloating)
+				break;
+		}
+	} else {
+		wl_list_for_each_reverse(c, &sel->link, link) {
+			if (&c->link == &clients)
+				continue;
+			if (VISIBLEON(c, selmon) && !c->isfloating)
+				break;
+		}
+	}
+	if (c == sel)
+		return;
+	wl_list_remove(&sel->link);
+	if (arg->i > 0)
+		wl_list_insert(&c->link, &sel->link);
+	else
+		wl_list_insert(c->link.prev, &sel->link);
+	arrange(selmon);
+}
+
 void
 zoom(const Arg *arg)
 {