A dialog for File->Merge

[Fonte Boa]

Wings crashes when i try to "merge selected".

Dump written 2014-3-26_21-40
Version: 1.5.2
Window: {dialog,#Ref<0.0.0.1179>}
Reason: function_clause

Short stack trace:
[]

Long stack trace:
[{lists,nth,
[0,
[{object,"cone1",
{winged,[[{edge,0,1,0,1,3,1,2,4}],
[{edge,0,15,16,0,31,2,0,29}],
(...)
[{edge,15,16,16,15,2,1,29,30}]],
[[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]],
[[<<63,240,0,0,0,0,0,0,191,240,0,0,0,0,0,0,0,0,0,0,
0,0,0,0>>],
[<<63,237,144,107,207,50,141,70,191,240,0,0,0,0,0,
0,63,216,125,226,166,174,169,99>>],
(..)
[<<0,0,0,0,0,0,0,0,63,240,0,0,0,0,0,0,0,0,0,0,0,0,
0,0>>]],
[]},
[{plugin_states,[{wings_shape,no_folder}]}]}]],
[{file,"lists.erl"},{line,168}]},
{wings_ff_wings,'-import_vsn2_sel/5-fun-3-',12,
[{file,"wings_ff_wings.erl"},{line,115}]},
{wings_ask,return_result,1,[{file,"wings_ask.erl"},{line,871}]},
{wings_wm,handle_event,3,[{file,"wings_wm.erl"},{line,825}]},
{wings_wm,send_event,2,[{file,"wings_wm.erl"},{line,797}]},
{wings_wm,do_dispatch,2,[{file,"wings_wm.erl"},{line,698}]},
{wings_wm,get_and_dispatch,0,[{file,"wings_wm.erl"},{line,612}]},
{wings,init,1,[{file,"wings.erl"},{line,154}]}]