[fixed] (UTF8 DATA Import)Crashed when import with an data name that contain UTF8

[tkbd]

Hum...,side effect is occurring.
In Wings which replaced your test plugin files.

I put into "ebin" folder:
wings_ff_wings.beam
wings_image_viewer.beam
wings_material.beam

and put Into "plugin/import_export":
wpc_collada.beam
wpc_stl.beam


When loading a simple wings file saved before, a crash log is output.
Only Latin charactors are used in a data in this file.

Apparently wings_ff_wings.beam seems to be involved.
Crash Log is here.

Internal Error
Version: 2.1.5
Window: geom
Reason: function_clause

Stack trace:
[{wings_we,update_id_bounds,
[{we,1,0,"Cube1",
{array,12,100,undefined,
{{{edge,0,...},{edge,...},{...},...},
{{edge,...},{...},...},
10,10,...}},
none,none,undefined,
{0,nil},
undefined,
{array,8,10,...},
{1,{...}},
default,0,...}],
[{file,"wings_we.erl"},{line,783}]},
{wings_ff_wings,share_list_2,3,
[{file,"f:/unixlike/src/wings/src/wings_ff_wings.erl"},
{line,1008}]},
{wings_ff_wings,import_objects,5,
[{file,"f:/unixlike/src/wings/src/wings_ff_wings.erl"},
{line,753}]},
{wings_ff_wings,import_objects,3,
[{file,"f:/unixlike/src/wings/src/wings_ff_wings.erl"},
{line,721}]},
{wings_ff_wings,import,2,
[{file,"f:/unixlike/src/wings/src/wings_ff_wings.erl"},
{line,28}]},
{wings_file,'-confirmed_open/2-fun-0-',3,
[{file,"wings_file.erl"},{line,348}]},
{wings_develop,time_command,2,[{file,"wings_develop.erl"},{line,73}]},
{wings,raw_command,4,[{file,"wings.erl"},{line,621}]},
{wings_wm,handle_event,3,[{file,"wings_wm.erl"},{line,952}]},
{wings_wm,send_event,2,[{file,"wings_wm.erl"},{line,918}]},
{wings_wm,do_dispatch,2,[{file,"wings_wm.erl"},{line,824}]},
{wings_wm,dispatch_event,1,[{file,[...]},{line,...}]},
{wings_wm,get_and_dispatch,0,[{file,...},{...}]},
{wings,init,1,[{...}|...]}]

Is this crash related to atom limitation? Or is it a simple bug?
If it is related to the limitation, I won't deepen about it.