bugfix: update handlers on new/delete

0061-new_pane_button

@@ -2,8 +2,10 @@ new_pane_button = function(x, y, r)
 	return overflowable_button('new', x, y, r,
 		function()
 			Show_menu = nil
+			Current_pane.car = car
 			Current_pane_index = Current_pane_index+1
 			table.insert(Panes, Current_pane_index, new_pane())
 			Current_pane = Panes[Current_pane_index]
+			car = {}
 		end)
-end
+end

0076-delete_pane_button

@@ -13,6 +13,7 @@ delete_pane_button = function(x, y, r)
 				Current_pane_index = Current_pane_index-1
 			end
 			Current_pane = Panes[Current_pane_index]
+			car = Current_pane.car or {}
 		end,
 		--[[final button]] true)
-end
+end