@@ -63,7 +63,7 @@ new_tsk.win = win;
 	new_tsk.desktop = window_get_desktop (win);
 	new_tsk.area.panel = &panel1[monitor];
 	new_tsk.current_state = window_is_iconified(win) ? TASK_ICONIFIED : TASK_NORMAL;
-	window_get_position(win, &new_tsk.win_x, &new_tsk.win_y);
+	window_get_coordinates(win, &new_tsk.win_x, &new_tsk.win_y, &new_tsk.win_w, &new_tsk.win_h);
 
 	// allocate only one title and one icon
 	// even with task_on_all_desktop and with task_on_all_panel
@@ -92,6 +92,10 @@ memcpy(&new_tsk2->area, &panel1[monitor].g_task.area, sizeof(Area));
 		new_tsk2->area.parent = tskbar;
 		new_tsk2->win = new_tsk.win;
 		new_tsk2->desktop = new_tsk.desktop;
+		new_tsk2->win_x = new_tsk.win_x;
+		new_tsk2->win_y = new_tsk.win_y;
+		new_tsk2->win_w = new_tsk.win_w;
+		new_tsk2->win_h = new_tsk.win_h;
 		new_tsk2->current_state = -1;  // to update the current state later in set_task_state...
 		if (new_tsk2->desktop == ALLDESKTOP && server.desktop != j) {
 			// hide ALLDESKTOP task on non-current desktop
@@ -116,7 +120,7 @@ *key = new_tsk.win;
 	g_hash_table_insert(win_to_task_table, key, task_group);
 	set_task_state(new_tsk2, new_tsk.current_state);
 
-	sort_tasks(tskbar);
+	sort_taskbar_for_win(win);
 
 	if (panel_mode == MULTI_DESKTOP) {
 		Panel *panel = new_tsk2->area.panel;

@@ -66,6 +66,8 @@ int urgent_tick;
 	// These may not be up-to-date
 	int win_x;
 	int win_y;
+	int win_w;
+	int win_h;
 } Task;
 
 

@@ -412,6 +412,8 @@ }
 
 gint compare_tasks(Task *a, Task *b, Taskbar *taskbar)
 {
+	int a_horiz_c, a_vert_c, b_horiz_c, b_vert_c;
+
 	if (a == b)
 		return 0;
 	if (taskbarname_enabled) {
@@ -420,10 +422,14 @@ return -1;
 		if (b == taskbar->area.list->data)
 			return 1;
 	}
-	if (a->win_x != b->win_x) {
-		return a->win_x - b->win_x;
+	a_horiz_c = a->win_x + a->win_w / 2;
+	b_horiz_c = b->win_x + b->win_w / 2;
+	a_vert_c = a->win_y + a->win_h / 2;
+	b_vert_c = b->win_y + b->win_h / 2;
+	if (a_horiz_c != b_horiz_c) {
+		return a_horiz_c - b_horiz_c;
 	}
-	return a->win_y - b->win_y;
+	return a_vert_c - b_vert_c;
 }
 
 int taskbar_needs_sort(Taskbar *taskbar)
@@ -455,3 +461,26 @@ taskbar->area.resize = 1;
 		panel_refresh = 1;
 	}
 }
+
+
+void sort_taskbar_for_win(Window win)
+{
+	if (sort_tasks_method == TASKBAR_SORT_POSITION) {
+		GPtrArray* task_group = task_get_tasks(win);
+		if (task_group) {
+			int i;
+			Task* tsk0 = g_ptr_array_index(task_group, 0);
+			if (tsk0) {
+				window_get_coordinates(win, &tsk0->win_x, &tsk0->win_y, &tsk0->win_w, &tsk0->win_h);
+			}
+			for (i = 0; i < task_group->len; ++i) {
+				Task* tsk = g_ptr_array_index(task_group, i);
+				tsk->win_x = tsk0->win_x;
+				tsk->win_y = tsk0->win_y;
+				tsk->win_w = tsk0->win_w;
+				tsk->win_h = tsk0->win_h;
+				sort_tasks(tsk->area.parent);
+			}
+		}
+	}
+}

@@ -76,6 +76,7 @@ 
 // show/hide taskbar according to current desktop
 void visible_taskbar(void *p);
 
+void sort_taskbar_for_win(Window win);
 void sort_tasks(Taskbar *taskbar);
 
 #endif

@@ -475,6 +475,9 @@ panel_refresh = 1;
 				task_dragged = 1;
 			}
 		}
+		if (sort_tasks_method == TASKBAR_SORT_POSITION) {
+			sort_tasks(event_taskbar);
+		}
 	}
 	else { // The event is on another taskbar than the task being dragged
 		if(task_drag->desktop == ALLDESKTOP || panel_mode != MULTI_DESKTOP)
@@ -495,6 +498,10 @@ task_drag->area.parent = event_taskbar;
 		task_drag->desktop = event_taskbar->desktop;
 
 		windows_set_desktop(task_drag->win, event_taskbar->desktop);
+
+		if (sort_tasks_method == TASKBAR_SORT_POSITION) {
+			sort_tasks(event_taskbar);
+		}
 
 		event_taskbar->area.resize = 1;
 		drag_taskbar->area.resize = 1;
@@ -846,13 +853,7 @@ }
 		}
 	}
 
-	if (sort_tasks_method == TASKBAR_SORT_POSITION) {
-		Task *tsk = task_get_task (win);
-		if (tsk) {
-			window_get_position(win, &tsk->win_x, &tsk->win_y);
-			sort_tasks(tsk->area.parent);
-		}
-	}
+	sort_taskbar_for_win(win);
 }
 
 char *GetAtomName(Display* disp, Atom a)

@@ -144,10 +144,15 @@ if (i == server.nb_monitor) return 0;
 	else return i;
 }
 
-void window_get_position (Window win, int *x, int *y)
+void window_get_coordinates (Window win, int *x, int *y, int *w, int *h)
 {
-	Window src;
-	XTranslateCoordinates(server.dsp, win, server.root_win, 0, 0, x, y, &src);
+	int dummy_int;
+	unsigned ww, wh, bw, bh;
+ 	Window src;
+ 	XTranslateCoordinates(server.dsp, win, server.root_win, 0, 0, x, y, &src);
+	XGetGeometry(server.dsp, win, &src, &dummy_int, &dummy_int, &ww, &wh, &bw, &bh);
+	*w = ww + bw;
+	*h = wh + bh;
 }
 
 int window_is_iconified (Window win)

@@ -18,7 +18,7 @@ void set_desktop (int desktop);
 void set_close (Window win);
 int server_get_current_desktop ();
 GSList *server_get_name_of_desktop ();
-void window_get_position (Window win, int *x, int *y);
+void window_get_coordinates (Window win, int *x, int *y, int *w, int *h);
 int window_is_iconified (Window win);
 int window_is_urgent (Window win);
 int window_is_hidden (Window win);