[fixed] Geometry graph + new folder

[Hank]

Hi there,

W3D 2.1.7

Steps:

1. Add any 2 objects.
2. Combine objects.
3. Create new folder in geometry graph
4. Select object and move to new folder

(geometry graph is gone) and you get
error:

Dump written 2018-10-3_10-41
Version: 2.1.7
OS: Windows 8 (build 9200), 64-bit edition
GPU: Intel | Intel® HD Graphics 520
Window: {object,geom}
Reason: function_clause

Short stack trace:
[{gb_trees,update_1,3,[{file,"gb_trees.erl"},{line,263}]},
{gb_trees,update,3,[{file,"gb_trees.erl"},{line,258}]},
{wings_obj,we_from_obj,2,
[{file,"c:/Users/familjen/src/wings/src/wings_obj.erl"},
{line,271}]},
{gb_trees,map_1,2,[{file,"gb_trees.erl"},{line,616}]},
{gb_trees,map,2,[{file,"gb_trees.erl"},{line,612}]},
{wings_obj,map,2,
[{file,"c:/Users/familjen/src/wings/src/wings_obj.erl"},
{line,132}]},
{wings_geom_win,action,2,
[{file,"c:/Users/familjen/src/wings/src/wings_geom_win.erl"},
{line,281}]},
{wings_geom_win,forward_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_geom_win.erl"},
{line,422}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,972}]},
{wings_wm,send_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,939}]},
{wings_wm,do_dispatch,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,840}]},
{wings_wm,dispatch_event,1,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,747}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,651}]},
{wings,init_part2,2,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,104}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

Long stack trace:
[{gb_trees,update_1,
[wings_shape,"new_folder",nil],
[{file,"gb_trees.erl"},{line,263}]},
{gb_trees,update,3,[{file,"gb_trees.erl"},{line,258}]},
{wings_obj,we_from_obj,2,
[{file,"c:/Users/familjen/src/wings/src/wings_obj.erl"},
{line,271}]},
{gb_trees,map_1,2,[{file,"gb_trees.erl"},{line,616}]},
{gb_trees,map,2,[{file,"gb_trees.erl"},{line,612}]},
{wings_obj,map,2,
[{file,"c:/Users/familjen/src/wings/src/wings_obj.erl"},
{line,132}]},
{wings_geom_win,action,2,
[{file,"c:/Users/familjen/src/wings/src/wings_geom_win.erl"},
{line,281}]},
{wings_geom_win,forward_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_geom_win.erl"},
{line,422}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,972}]},
{wings_wm,send_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,939}]},
{wings_wm,do_dispatch,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,840}]},
{wings_wm,dispatch_event,1,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,747}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,651}]},
{wings,init_part2,2,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,104}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

BR, Hank