feat: opt-in config field to have typical dwindle tiling

src/animation/client.h

@@ -432,6 +432,11 @@ void client_set_drop_area(Client *c) {
 
 	struct wlr_box drop_box;
 
+	const Layout *cur_layout =
+		c->mon ? c->mon->pertag->ltidxs[c->mon->pertag->curtag] : NULL;
+	bool dwindle_familiar = cur_layout && cur_layout->id == DWINDLE &&
+							config.dwindle_drop_simple_split;
+
 	// 中心区域：x和y都在30%~70%之间 → 无方向
 	if (rel_x > client_width * 0.3 && rel_x < client_width * 0.7 &&
 		rel_y > client_height * 0.3 && rel_y < client_height * 0.7) {
@@ -440,6 +445,40 @@ void client_set_drop_area(Client *c) {
 		drop_box.width = client_width * 0.4;
 		drop_box.height = client_height * 0.4;
 		drop_direction = UNDIR;
+	} else if (dwindle_familiar) {
+		// Mirror dwindle_assign's split_h = (aw >= ah) rule so the preview
+		// matches the auto-rotated split that dwindle will produce.
+		bool split_h = c->geom.width >= c->geom.height;
+		float ratio = config.dwindle_split_ratio;
+		if (split_h) {
+			if (rel_x < client_width * 0.5) {
+				drop_direction = LEFT;
+				drop_box.x = bw;
+				drop_box.y = bw;
+				drop_box.width = (int32_t)(client_width * ratio);
+				drop_box.height = client_height;
+			} else {
+				drop_direction = RIGHT;
+				drop_box.x = bw + (int32_t)(client_width * ratio);
+				drop_box.y = bw;
+				drop_box.width = client_width - (int32_t)(client_width * ratio);
+				drop_box.height = client_height;
+			}
+		} else {
+			if (rel_y < client_height * 0.5) {
+				drop_direction = UP;
+				drop_box.x = bw;
+				drop_box.y = bw;
+				drop_box.width = client_width;
+				drop_box.height = (int32_t)(client_height * ratio);
+			} else {
+				drop_direction = DOWN;
+				drop_box.x = bw;
+				drop_box.y = bw + (int32_t)(client_height * ratio);
+				drop_box.width = client_width;
+				drop_box.height = client_height - (int32_t)(client_height * ratio);
+			}
+		}
 	} else {
 		// 否则根据到各边的距离决定方向
 		double dist_left = rel_x;

src/config/parse_config.h

@@ -243,6 +243,7 @@ typedef struct {
 	int32_t dwindle_preserve_split;
 	int32_t dwindle_smart_split;
 	int32_t dwindle_smart_resize;
+	int32_t dwindle_drop_simple_split;
 	float dwindle_split_ratio;
 
 	uint32_t hotarea_size;
@@ -1576,6 +1577,8 @@ bool parse_option(Config *config, char *key, char *value) {
 		config->dwindle_smart_split = atoi(value);
 	} else if (strcmp(key, "dwindle_smart_resize") == 0) {
 		config->dwindle_smart_resize = atoi(value);
+	} else if (strcmp(key, "dwindle_drop_simple_split") == 0) {
+		config->dwindle_drop_simple_split = atoi(value);
 	} else if (strcmp(key, "dwindle_split_ratio") == 0) {
 		config->dwindle_split_ratio = atof(value);
 	} else if (strcmp(key, "hotarea_size") == 0) {
@@ -3118,6 +3121,8 @@ void override_config(void) {
 		CLAMP_INT(config.dwindle_preserve_split, 0, 1);
 	config.dwindle_smart_split = CLAMP_INT(config.dwindle_smart_split, 0, 1);
 	config.dwindle_smart_resize = CLAMP_INT(config.dwindle_smart_resize, 0, 1);
+	config.dwindle_drop_simple_split =
+		CLAMP_INT(config.dwindle_drop_simple_split, 0, 1);
 	config.dwindle_split_ratio =
 		CLAMP_FLOAT(config.dwindle_split_ratio, 0.05f, 0.95f);
 	config.hotarea_size = CLAMP_INT(config.hotarea_size, 1, 1000);
@@ -3239,6 +3244,7 @@ void set_value_default() {
 	config.dwindle_preserve_split = 0;
 	config.dwindle_smart_split = 0;
 	config.dwindle_smart_resize = 0;
+	config.dwindle_drop_simple_split = 0;
 	config.dwindle_split_ratio = 0.5f;
 
 	config.log_level = WLR_ERROR;

src/mango.c

@@ -2247,7 +2247,7 @@ void place_drag_tile_client(Client *c) {
 							closest->drop_direction == RIGHT);
 			dwindle_insert(&c->mon->pertag->dwindle_root[tag], c, closest,
 						   config.dwindle_split_ratio, insert_before, split_h,
-						   true);
+						   !config.dwindle_drop_simple_split);
 			setfloating(c, 0);
 			return;
 		}