feat: dwindwl first test

src/config/parse_config.h

@@ -242,6 +242,14 @@ typedef struct {
 	int32_t center_master_overspread;
 	int32_t center_when_single_stack;
 
+	/* dwindle layout */
+	int32_t dwindle_vsplit;
+	int32_t dwindle_hsplit;
+	int32_t dwindle_preserve_split;
+	int32_t dwindle_smart_split;
+	int32_t dwindle_smart_resize;
+	float dwindle_split_ratio;
+
 	uint32_t hotarea_size;
 	uint32_t hotarea_corner;
 	uint32_t enable_hotarea;
@@ -1615,6 +1623,18 @@ bool parse_option(Config *config, char *key, char *value) {
 		config->center_master_overspread = atoi(value);
 	} else if (strcmp(key, "center_when_single_stack") == 0) {
 		config->center_when_single_stack = atoi(value);
+	} else if (strcmp(key, "dwindle_vsplit") == 0) {
+		config->dwindle_vsplit = atoi(value);
+	} else if (strcmp(key, "dwindle_hsplit") == 0) {
+		config->dwindle_hsplit = atoi(value);
+	} else if (strcmp(key, "dwindle_preserve_split") == 0) {
+		config->dwindle_preserve_split = atoi(value);
+	} else if (strcmp(key, "dwindle_smart_split") == 0) {
+		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_split_ratio") == 0) {
+		config->dwindle_split_ratio = atof(value);
 	} else if (strcmp(key, "hotarea_size") == 0) {
 		config->hotarea_size = atoi(value);
 	} else if (strcmp(key, "hotarea_corner") == 0) {
@@ -3179,6 +3199,14 @@ void override_config(void) {
 	config.center_when_single_stack =
 		CLAMP_INT(config.center_when_single_stack, 0, 1);
 	config.new_is_master = CLAMP_INT(config.new_is_master, 0, 1);
+	config.dwindle_vsplit = CLAMP_INT(config.dwindle_vsplit, 0, 2);
+	config.dwindle_hsplit = CLAMP_INT(config.dwindle_hsplit, 0, 2);
+	config.dwindle_preserve_split =
+		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_split_ratio =
+		CLAMP_FLOAT(config.dwindle_split_ratio, 0.05f, 0.95f);
 	config.hotarea_size = CLAMP_INT(config.hotarea_size, 1, 1000);
 	config.hotarea_corner = CLAMP_INT(config.hotarea_corner, 0, 3);
 	config.enable_hotarea = CLAMP_INT(config.enable_hotarea, 0, 1);
@@ -3318,6 +3346,13 @@ void set_value_default() {
 	config.center_master_overspread = 0;
 	config.center_when_single_stack = 1;
 
+	config.dwindle_vsplit = 0;
+	config.dwindle_hsplit = 0;
+	config.dwindle_preserve_split = 0;
+	config.dwindle_smart_split = 0;
+	config.dwindle_smart_resize = 0;
+	config.dwindle_split_ratio = 0.5f;
+
 	config.log_level = WLR_ERROR;
 	config.numlockon = 0;
 	config.capslock = 0;

src/dispatch/bind_define.h

@@ -112,6 +112,10 @@ int32_t exchange_client(const Arg *arg) {
 
 	Client *tc = direction_select(arg);
 	tc = get_focused_stack_client(tc);
+
+	if (!tc)
+		return 0;
+
 	exchange_two_client(c, tc);
 	return 0;
 }

src/layout/arrange.h

@@ -488,6 +488,29 @@ void resize_tile_master_vertical(Client *grabc, bool isdrag, int32_t offsetx,
 	}
 }
 
+void resize_tile_dwindle(Client *grabc, bool isdrag, int32_t offsetx,
+						 int32_t offsety, uint32_t time, bool isvertical) {
+
+	if (!start_drag_window) {
+		dwindle_resize_client_step(grabc->mon, grabc, offsetx, offsety);
+	}
+
+	if (isdrag) {
+		int32_t dx = (int32_t)round(cursor->x) - drag_begin_cursorx;
+		int32_t dy = (int32_t)round(cursor->y) - drag_begin_cursory;
+		dwindle_resize_client(grabc->mon, grabc, dx, dy);
+	} else if (last_apply_drap_time == 0 ||
+			   time - last_apply_drap_time >
+				   config.drag_tile_refresh_interval) {
+		dwindle_resize_client(grabc->mon, grabc, offsetx, offsety);
+		last_apply_drap_time = time;
+	}
+
+	if (!isdrag) {
+		start_drag_window = false;
+	}
+}
+
 void resize_tile_scroller(Client *grabc, bool isdrag, int32_t offsetx,
 						  int32_t offsety, uint32_t time, bool isvertical) {
 	Client *tc = NULL;
@@ -706,6 +729,8 @@ void resize_tile_client(Client *grabc, bool isdrag, int32_t offsetx,
 		resize_tile_scroller(grabc, isdrag, offsetx, offsety, time, false);
 	} else if (current_layout->id == VERTICAL_SCROLLER) {
 		resize_tile_scroller(grabc, isdrag, offsetx, offsety, time, true);
+	} else if (current_layout->id == DWINDLE) {
+		resize_tile_dwindle(grabc, isdrag, offsetx, offsety, time, true);
 	}
 }
 

src/layout/dwindle.h

@@ -0,0 +1,435 @@
+typedef struct DwindleNode DwindleNode;
+struct DwindleNode {
+	bool is_split;
+	bool split_h;
+	bool split_locked;
+	float ratio;
+	float drag_init_ratio;
+	int32_t container_x;
+	int32_t container_y;
+	int32_t container_w;
+	int32_t container_h;
+	DwindleNode *parent;
+	DwindleNode *first;
+	DwindleNode *second;
+	Client *client;
+};
+
+static DwindleNode *dwindle_locked_h_node = NULL;
+static DwindleNode *dwindle_locked_v_node = NULL;
+
+static DwindleNode *dwindle_new_leaf(Client *c) {
+	DwindleNode *n = calloc(1, sizeof(DwindleNode));
+	n->client = c;
+	return n;
+}
+
+static DwindleNode *dwindle_find_leaf(DwindleNode *node, Client *c) {
+	if (!node)
+		return NULL;
+	if (!node->is_split)
+		return node->client == c ? node : NULL;
+	DwindleNode *r = dwindle_find_leaf(node->first, c);
+	return r ? r : dwindle_find_leaf(node->second, c);
+}
+
+static DwindleNode *dwindle_first_leaf(DwindleNode *node) {
+	if (!node)
+		return NULL;
+	while (node->is_split)
+		node = node->first;
+	return node;
+}
+
+static void dwindle_free_tree(DwindleNode *node) {
+	if (!node)
+		return;
+	dwindle_free_tree(node->first);
+	dwindle_free_tree(node->second);
+	free(node);
+}
+
+static void dwindle_insert(DwindleNode **root, Client *new_c, Client *focused,
+						   float ratio, bool as_first) {
+	DwindleNode *new_leaf = dwindle_new_leaf(new_c);
+
+	if (!*root) {
+		*root = new_leaf;
+		return;
+	}
+
+	DwindleNode *target = focused ? dwindle_find_leaf(*root, focused) : NULL;
+	if (!target)
+		target = dwindle_first_leaf(*root);
+
+	DwindleNode *split = calloc(1, sizeof(DwindleNode));
+	split->is_split = true;
+	split->ratio = ratio;
+	if (as_first) {
+		split->first = new_leaf;
+		split->second = target;
+	} else {
+		split->first = target;
+		split->second = new_leaf;
+	}
+	split->parent = target->parent;
+	target->parent = split;
+	new_leaf->parent = split;
+
+	if (!split->parent) {
+		*root = split;
+	} else {
+		if (split->parent->first == target)
+			split->parent->first = split;
+		else
+			split->parent->second = split;
+	}
+}
+
+static void dwindle_remove(DwindleNode **root, Client *c) {
+	DwindleNode *leaf = dwindle_find_leaf(*root, c);
+	if (!leaf)
+		return;
+
+	DwindleNode *parent = leaf->parent;
+	if (!parent) {
+		free(leaf);
+		*root = NULL;
+		return;
+	}
+
+	DwindleNode *sibling =
+		(parent->first == leaf) ? parent->second : parent->first;
+	DwindleNode *grandparent = parent->parent;
+	sibling->parent = grandparent;
+
+	/* Preserve split direction on sibling split-nodes when requested. */
+	if (!sibling->is_split ||
+		(!config.dwindle_preserve_split && !config.dwindle_smart_split)) {
+		sibling->container_w = 0;
+		sibling->container_h = 0;
+	}
+
+	if (!grandparent) {
+		*root = sibling;
+	} else {
+		if (grandparent->first == parent)
+			grandparent->first = sibling;
+		else
+			grandparent->second = sibling;
+	}
+
+	free(leaf);
+	free(parent);
+}
+
+static void dwindle_assign(DwindleNode *node, int32_t ax, int32_t ay,
+						   int32_t aw, int32_t ah, int32_t gap_h,
+						   int32_t gap_v) {
+	if (!node)
+		return;
+
+	if (!node->is_split) {
+		if (node->client) {
+			struct wlr_box box = {ax, ay, MAX(1, aw), MAX(1, ah)};
+			resize(node->client, box, 0);
+		}
+		return;
+	}
+
+	if (!node->split_locked && node->container_w == 0 && node->container_h == 0)
+		node->split_h = (aw >= ah);
+	node->container_x = ax;
+	node->container_y = ay;
+	node->container_w = aw;
+	node->container_h = ah;
+	if (node->split_h) {
+		int32_t w1 = MAX(1, (int32_t)(aw * node->ratio) - gap_h / 2);
+		dwindle_assign(node->first, ax, ay, w1, ah, gap_h, gap_v);
+		dwindle_assign(node->second, ax + w1 + gap_h, ay, aw - w1 - gap_h, ah,
+					   gap_h, gap_v);
+	} else {
+		int32_t h1 = MAX(1, (int32_t)(ah * node->ratio) - gap_v / 2);
+		dwindle_assign(node->first, ax, ay, aw, h1, gap_h, gap_v);
+		dwindle_assign(node->second, ax, ay + h1 + gap_v, aw, ah - h1 - gap_v,
+					   gap_h, gap_v);
+	}
+}
+
+static void dwindle_move_client(DwindleNode **root, Client *c, Client *target,
+								float ratio, int32_t dir) {
+	if (!c || !target || c == target)
+		return;
+	if (!dwindle_find_leaf(*root, c) || !dwindle_find_leaf(*root, target))
+		return;
+	dwindle_remove(root, c);
+	bool as_first = (dir == UP || dir == LEFT);
+	dwindle_insert(root, c, target, ratio, as_first);
+}
+
+static void dwindle_swap_clients(DwindleNode **root, Client *a, Client *b) {
+	DwindleNode *la = dwindle_find_leaf(*root, a);
+	DwindleNode *lb = dwindle_find_leaf(*root, b);
+	if (!la || !lb || la == lb)
+		return;
+	la->client = b;
+	lb->client = a;
+}
+
+static void dwindle_resize_client(Monitor *m, Client *c, int32_t dx,
+								  int32_t dy) {
+	uint32_t tag = m->pertag->curtag;
+	DwindleNode *leaf = dwindle_find_leaf(m->pertag->dwindle_root[tag], c);
+	if (!leaf)
+		return;
+
+	if (!start_drag_window) {
+		start_drag_window = true;
+		dwindle_locked_h_node = NULL;
+		dwindle_locked_v_node = NULL;
+		DwindleNode *node = leaf->parent;
+		while (node) {
+			if (node->split_h && !dwindle_locked_h_node) {
+				dwindle_locked_h_node = node;
+				node->drag_init_ratio = node->ratio;
+			}
+			if (!node->split_h && !dwindle_locked_v_node) {
+				dwindle_locked_v_node = node;
+				node->drag_init_ratio = node->ratio;
+			}
+			if (dwindle_locked_h_node && dwindle_locked_v_node)
+				break;
+			node = node->parent;
+		}
+	}
+
+	if (!dwindle_locked_h_node && !dwindle_locked_v_node)
+		return;
+
+	if (dwindle_locked_h_node) {
+		float cw = (float)MAX(1, dwindle_locked_h_node->container_w);
+		float ox = (float)(cursor->x - drag_begin_cursorx);
+		if (config.dwindle_smart_resize) {
+			/* Move the boundary toward the cursor: invert direction when
+			 * the drag started on the right side of the split line. */
+			float split_x = dwindle_locked_h_node->container_x +
+							cw * dwindle_locked_h_node->drag_init_ratio;
+			if (drag_begin_cursorx >= split_x)
+				ox = -ox;
+		}
+		dwindle_locked_h_node->ratio =
+			dwindle_locked_h_node->drag_init_ratio + ox / cw;
+		dwindle_locked_h_node->ratio =
+			CLAMP_FLOAT(dwindle_locked_h_node->ratio, 0.05f, 0.95f);
+	}
+
+	if (dwindle_locked_v_node) {
+		float ch = (float)MAX(1, dwindle_locked_v_node->container_h);
+		float oy = (float)(cursor->y - drag_begin_cursory);
+		if (config.dwindle_smart_resize) {
+			/* Same logic for the vertical split line. */
+			float split_y = dwindle_locked_v_node->container_y +
+							ch * dwindle_locked_v_node->drag_init_ratio;
+			if (drag_begin_cursory >= split_y)
+				oy = -oy;
+		}
+		dwindle_locked_v_node->ratio =
+			dwindle_locked_v_node->drag_init_ratio + oy / ch;
+		dwindle_locked_v_node->ratio =
+			CLAMP_FLOAT(dwindle_locked_v_node->ratio, 0.05f, 0.95f);
+	}
+
+	int32_t n = m->visible_tiling_clients;
+	int32_t gap_ih = enablegaps ? m->gappih : 0;
+	int32_t gap_iv = enablegaps ? m->gappiv : 0;
+	int32_t gap_oh = enablegaps ? m->gappoh : 0;
+	int32_t gap_ov = enablegaps ? m->gappov : 0;
+	if (config.smartgaps && n == 1)
+		gap_ih = gap_iv = gap_oh = gap_ov = 0;
+
+	dwindle_assign(m->pertag->dwindle_root[tag], m->w.x + gap_oh,
+				   m->w.y + gap_ov, m->w.width - 2 * gap_oh,
+				   m->w.height - 2 * gap_ov, gap_ih, gap_iv);
+}
+
+static void dwindle_resize_client_step(Monitor *m, Client *c, int32_t dx,
+									   int32_t dy) {
+	uint32_t tag = m->pertag->curtag;
+	DwindleNode *leaf = dwindle_find_leaf(m->pertag->dwindle_root[tag], c);
+	if (!leaf)
+		return;
+
+	DwindleNode *h_node = NULL;
+	DwindleNode *v_node = NULL;
+	DwindleNode *node = leaf->parent;
+	drag_begin_cursorx = cursor->x;
+	drag_begin_cursory = cursor->y;
+
+	while (node) {
+		if (node->split_h && !h_node)
+			h_node = node;
+		if (!node->split_h && !v_node)
+			v_node = node;
+		if (h_node && v_node)
+			break;
+		node = node->parent;
+	}
+
+	if (!h_node && !v_node)
+		return;
+
+	if (h_node && dx) {
+		float cw = (float)MAX(1, h_node->container_w);
+		float delta = (float)dx / cw;
+		h_node->ratio = CLAMP_FLOAT(h_node->ratio + delta, 0.05f, 0.95f);
+	}
+
+	if (v_node && dy) {
+		float ch = (float)MAX(1, v_node->container_h);
+		float delta = (float)dy / ch;
+		v_node->ratio = CLAMP_FLOAT(v_node->ratio + delta, 0.05f, 0.95f);
+	}
+
+	int32_t n_clients = m->visible_tiling_clients;
+	int32_t gap_ih = enablegaps ? m->gappih : 0;
+	int32_t gap_iv = enablegaps ? m->gappiv : 0;
+	int32_t gap_oh = enablegaps ? m->gappoh : 0;
+	int32_t gap_ov = enablegaps ? m->gappov : 0;
+	if (config.smartgaps && n_clients == 1)
+		gap_ih = gap_iv = gap_oh = gap_ov = 0;
+
+	dwindle_assign(m->pertag->dwindle_root[tag], m->w.x + gap_oh,
+				   m->w.y + gap_ov, m->w.width - 2 * gap_oh,
+				   m->w.height - 2 * gap_ov, gap_ih, gap_iv);
+}
+
+static void dwindle_remove_client(Client *c) {
+	Monitor *m;
+	wl_list_for_each(m, &mons, link) {
+		for (uint32_t t = 0; t < LENGTH(tags) + 1; t++)
+			dwindle_remove(&m->pertag->dwindle_root[t], c);
+	}
+}
+
+/* Insert a new client respecting dwindle_vsplit, dwindle_hsplit, and
+ * dwindle_smart_split config options. */
+static void dwindle_insert_with_config(DwindleNode **root, Client *new_c,
+									   Client *focused, float ratio) {
+	bool as_first = false;
+
+	if (focused) {
+		struct wlr_box *fg = &focused->geom;
+		double fcx = fg->x + fg->width * 0.5;
+		double fcy = fg->y + fg->height * 0.5;
+
+		if (config.dwindle_smart_split) {
+			/* Divide the focused window into 4 triangles using its diagonals.
+			 * The triangle the cursor falls in determines both the split axis
+			 * and which side the new window appears on. */
+			double nx = (cursor->x - fcx) / (fg->width * 0.5);
+			double ny = (cursor->y - fcy) / (fg->height * 0.5);
+			bool do_split_h;
+			if (fabs(ny) > fabs(nx)) {
+				do_split_h = false;
+				as_first = (ny < 0); /* top triangle → new window on top */
+			} else {
+				do_split_h = true;
+				as_first = (nx < 0); /* left triangle → new window on left */
+			}
+			dwindle_insert(root, new_c, focused, ratio, as_first);
+			DwindleNode *leaf = dwindle_find_leaf(*root, new_c);
+			if (leaf && leaf->parent) {
+				leaf->parent->split_h = do_split_h;
+				leaf->parent->split_locked = true;
+			}
+			return;
+		}
+
+		/* Predict likely split direction from the focused window's shape. */
+		bool likely_h = (fg->width >= fg->height);
+		if (likely_h) {
+			if (config.dwindle_hsplit == 0)
+				as_first = (cursor->x < fcx); /* follow mouse */
+			else
+				as_first = (config.dwindle_hsplit == 2); /* 2=left, 1=right */
+		} else {
+			if (config.dwindle_vsplit == 0)
+				as_first = (cursor->y < fcy); /* follow mouse */
+			else
+				as_first = (config.dwindle_vsplit == 2); /* 2=top, 1=bottom */
+		}
+	}
+
+	dwindle_insert(root, new_c, focused, ratio, as_first);
+}
+
+void dwindle(Monitor *m) {
+	int32_t n = m->visible_tiling_clients;
+	if (n == 0)
+		return;
+
+	uint32_t tag = m->pertag->curtag;
+	DwindleNode **root = &m->pertag->dwindle_root[tag];
+	float ratio = config.dwindle_split_ratio;
+
+	Client *vis[512];
+	int32_t count = 0;
+	Client *c;
+	wl_list_for_each(c, &clients, link) {
+		if (VISIBLEON(c, m) && ISTILED(c))
+			vis[count++] = c;
+		if (count >= 512)
+			break;
+	}
+
+	{
+		DwindleNode *leaves[512];
+		int32_t lc = 0;
+
+		DwindleNode *stack[1024];
+		int32_t sp = 0;
+		if (*root)
+			stack[sp++] = *root;
+		while (sp > 0) {
+			DwindleNode *nd = stack[--sp];
+			if (!nd->is_split) {
+				leaves[lc++] = nd;
+			} else {
+				if (nd->second)
+					stack[sp++] = nd->second;
+				if (nd->first)
+					stack[sp++] = nd->first;
+			}
+		}
+
+		for (int32_t i = 0; i < lc; i++) {
+			bool found = false;
+			for (int32_t j = 0; j < count; j++)
+				if (vis[j] == leaves[i]->client) {
+					found = true;
+					break;
+				}
+			if (!found)
+				dwindle_remove(root, leaves[i]->client);
+		}
+	}
+
+	Client *focused = focustop(m);
+	if (focused && !dwindle_find_leaf(*root, focused))
+		focused = m->sel;
+	for (int32_t i = 0; i < count; i++) {
+		if (!dwindle_find_leaf(*root, vis[i]))
+			dwindle_insert_with_config(root, vis[i], focused, ratio);
+	}
+
+	int32_t gap_ih = enablegaps ? m->gappih : 0;
+	int32_t gap_iv = enablegaps ? m->gappiv : 0;
+	int32_t gap_oh = enablegaps ? m->gappoh : 0;
+	int32_t gap_ov = enablegaps ? m->gappov : 0;
+	if (config.smartgaps && n == 1)
+		gap_ih = gap_iv = gap_oh = gap_ov = 0;
+
+	dwindle_assign(*root, m->w.x + gap_oh, m->w.y + gap_ov,
+				   m->w.width - 2 * gap_oh, m->w.height - 2 * gap_ov, gap_ih,
+				   gap_iv);
+}

src/layout/layout.h

@@ -12,6 +12,7 @@ static void vertical_grid(Monitor *m);
 static void vertical_scroller(Monitor *m);
 static void vertical_deck(Monitor *mon);
 static void tgmix(Monitor *m);
+static void dwindle(Monitor *m);
 
 /* layout(s) */
 Layout overviewlayout = {"󰃇", overview, "overview"};
@@ -29,6 +30,7 @@ enum {
 	VERTICAL_DECK,
 	RIGHT_TILE,
 	TGMIX,
+	DWINDLE,
 };
 
 Layout layouts[] = {
@@ -47,4 +49,5 @@ Layout layouts[] = {
 	{"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
 	{"TG", tgmix, "tgmix", TGMIX},						   // 混合布局
+	{"DW", dwindle, "dwindle", DWINDLE},
 };

src/mango.c

@@ -560,6 +560,8 @@ typedef struct {
 	struct wl_listener destroy;
 } SessionLock;
 
+typedef struct DwindleNode DwindleNode;
+
 /* function declarations */
 static void applybounds(
 	Client *c,
@@ -815,6 +817,12 @@ static void client_pending_maximized_state(Client *c, int32_t ismaximized);
 static void client_pending_minimized_state(Client *c, int32_t isminimized);
 static void scroller_insert_stack(Client *c, Client *target_client,
 								  bool insert_before);
+static void dwindle_move_client(DwindleNode **root, Client *c, Client *target,
+								float ratio, int32_t dir);
+static void dwindle_resize_client_step(Monitor *m, Client *c, int32_t dx,
+									   int32_t dy);
+static void dwindle_resize_client(Monitor *m, Client *c, int32_t dx,
+								  int32_t dy);
 
 #include "data/static_keymap.h"
 #include "dispatch/bind_declare.h"
@@ -946,6 +954,7 @@ struct Pertag {
 	int32_t no_hide[LENGTH(tags) + 1];	/* no_hide per tag */
 	int32_t no_render_border[LENGTH(tags) + 1]; /* no_render_border per tag */
 	int32_t open_as_floating[LENGTH(tags) + 1]; /* open_as_floating per tag */
+	struct DwindleNode *dwindle_root[LENGTH(tags) + 1];
 	const Layout
 		*ltidxs[LENGTH(tags) + 1]; /* matrix of tags and layouts indexes  */
 };
@@ -1018,6 +1027,7 @@ static struct wl_event_source *sync_keymap;
 #include "ext-protocol/all.h"
 #include "fetch/fetch.h"
 #include "layout/arrange.h"
+#include "layout/dwindle.h"
 #include "layout/horizontal.h"
 #include "layout/vertical.h"
 
@@ -1179,6 +1189,17 @@ void swallow(Client *c, Client *w) {
 	client_pending_fullscreen_state(c, w->isfullscreen);
 	client_pending_maximized_state(c, w->ismaximizescreen);
 	client_pending_minimized_state(c, w->isminimized);
+
+	Monitor *m;
+	wl_list_for_each(m, &mons, link) {
+		for (uint32_t t = 0; t < LENGTH(tags) + 1; t++) {
+			DwindleNode **root = &m->pertag->dwindle_root[t];
+			dwindle_remove(root, c);
+			DwindleNode *wn = dwindle_find_leaf(*root, w);
+			if (wn)
+				wn->client = c;
+		}
+	}
 }
 
 bool switch_scratchpad_client_state(Client *c) {
@@ -2194,6 +2215,13 @@ void place_drag_tile_client(Client *c) {
 			try_scroller_drop(c, closest, 1);
 			return;
 		}
+		if (layout->id == DWINDLE) {
+			uint32_t tag = c->mon->pertag->curtag;
+			bool insert_before = closest->drop_direction == LEFT ||
+								 closest->drop_direction == UP;
+			dwindle_insert(&c->mon->pertag->dwindle_root[tag], c, closest,
+						   config.dwindle_split_ratio, insert_before);
+		}
 
 		if (closest->drop_direction == LEFT || closest->drop_direction == UP) {
 			wl_list_remove(&c->link);
@@ -5101,10 +5129,20 @@ void exchange_two_client(Client *c1, Client *c2) {
 		tmp_tags = c2->tags;
 		setmon(c2, c1->mon, c1->tags, false);
 		setmon(c1, tmp_mon, tmp_tags, false);
+		if (c1->mon &&
+			c1->mon->pertag->ltidxs[c1->mon->pertag->curtag]->id == DWINDLE)
+			dwindle_swap_clients(
+				&c1->mon->pertag->dwindle_root[c1->mon->pertag->curtag], c1,
+				c2);
 		arrange(c1->mon, false, false);
 		arrange(c2->mon, false, false);
 		focusclient(c1, 0);
 	} else {
+		if (c1->mon &&
+			c1->mon->pertag->ltidxs[c1->mon->pertag->curtag]->id == DWINDLE)
+			dwindle_swap_clients(
+				&c1->mon->pertag->dwindle_root[c1->mon->pertag->curtag], c1,
+				c2);
 		arrange(c1->mon, false, false);
 	}
 
@@ -6343,6 +6381,7 @@ void unmapnotify(struct wl_listener *listener, void *data) {
 	c->next_in_stack = NULL;
 	c->prev_in_stack = NULL;
 
+	dwindle_remove_client(c);
 	wlr_scene_node_destroy(&c->scene->node);
 	printstatus();
 	motionnotify(0, NULL, 0, 0, 0, 0);