initial layout setup and config learning

src/layout/horizontal.h

@@ -782,6 +782,17 @@ void right_tile(Monitor *m) {
 	}
 }
 
+void dual_scroller(Monitor *m) {
+	Client *c = NULL;
+	wl_list_for_each(c, &clients, link) {
+		c->geom.x = m->w.x;
+		c->geom.y = m->w.y;
+		c->geom.width = m->w.width;
+		c->geom.height = m->w.height;
+		resize(c, c->geom, 0);
+	}
+}
+
 void // 17
 monocle(Monitor *m) {
 	Client *c = NULL;

src/layout/layout.h

@@ -12,6 +12,8 @@ static void vertical_grid(Monitor *m);
 static void vertical_scroller(Monitor *m);
 static void vertical_deck(Monitor *mon);
 
+static void dual_scroller(Monitor *mon);
+
 /* layout(s) */
 Layout overviewlayout = {"󰃇", overview, "overview"};
 
@@ -27,6 +29,8 @@ enum {
 	VERTICAL_GRID,
 	VERTICAL_DECK,
 	RIGHT_TILE,
+		
+	DUAL_SCROLLER,
 };
 
 Layout layouts[] = {
@@ -44,4 +48,6 @@ Layout layouts[] = {
 	{"VT", vertical_tile, "vertical_tile", VERTICAL_TILE}, // 垂直平铺布局
 	{"VG", vertical_grid, "vertical_grid", VERTICAL_GRID}, // 垂直格子布局
 	{"VK", vertical_deck, "vertical_deck", VERTICAL_DECK}, // 垂直卡片布局
+
+	{"DS", dual_scroller, "dual_scroller", DUAL_SCROLLER}, // 垂直卡片布局
 };