Revert "commands/move: maintain workspace_layout when moving"

This is in preparation for changing the workspace_layout
command to work like it does in i3.

This reverts commit b4a75a1ab2.

sway/commands/move.c

@@ -276,11 +276,12 @@ static void workspace_rejigger(struct sway_workspace *ws,
 		return;
 	}
 	container_detach(child);
-	workspace_wrap_children(ws);
+	struct sway_container *new_parent = workspace_wrap_children(ws);
 
 	int index =
 		move_dir == WLR_DIRECTION_LEFT || move_dir == WLR_DIRECTION_UP ? 0 : 1;
 	workspace_insert_tiling(ws, child, index);
+	container_flatten(new_parent);
 	ws->layout =
 		move_dir == WLR_DIRECTION_LEFT || move_dir == WLR_DIRECTION_RIGHT ?
 		L_HORIZ : L_VERT;
@@ -340,11 +341,8 @@ static bool container_move_in_direction(struct sway_container *container,
 							container_insert_child(current->parent, container,
 									index + (offs < 0 ? 0 : 1));
 						} else {
-							struct sway_workspace *ws = current->workspace;
-							workspace_insert_tiling(ws,
-								container_split(container,
-									output_get_default_layout(ws->output)),
-								index + (offs < 0 ? 0 : 1));
+							workspace_insert_tiling(current->workspace, container,
+									index + (offs < 0 ? 0 : 1));
 						}
 						return true;
 					}

sway/tree/container.c

@@ -1355,16 +1355,6 @@ void container_detach(struct sway_container *child) {
 		container_update_representation(old_parent);
 		node_set_dirty(&old_parent->node);
 	} else if (old_workspace) {
-		// We may have removed the last tiling child from the workspace. If the
-		// workspace layout was e.g. tabbed, then at this point it may be just
-		// H[]. So, reset it to the default (e.g. T[]) for next time.
-		// But if we are evacuating a workspace with only sticky floating
-		// containers, the workspace will already be detached from the output.
-		if (old_workspace->output && !old_workspace->tiling->length) {
-			old_workspace->layout =
-				output_get_default_layout(old_workspace->output);
-		}
-
 		workspace_update_representation(old_workspace);
 		node_set_dirty(&old_workspace->node);
 	}