[workaround] uv assign / vertex color set&ignore

[Hank]

hello,

I'm working with one project and few times I got below error:

Dump written 2019-1-5_19-1
Version: 2.2.1
Window: {autouv,1}
e,wings_image,<0.74.0>]
Reason: {error,function_clause,
[{gb_trees,get_1,[12,nil],[{file,"gb_trees.erl"},{line,244}]},
{wings_image,do_update,3,
[{file,"wings_image.erl"},{line,413}]},
{wings_image,handle_call,3,
[{file,"wings_image.erl"},{line,324}]},
{gen_server,try_handle_call,4,
[{file,"gen_server.erl"},{line,636}]},
{gen_server,handle_msg,6,[{file,"gen_server.erl"},{line,665}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,247}]}]}

Hard to find out what might be real root cause, but I make few test with material with vertex color set/ignore and re-create texture once again... hope you can fix it.

UPDATE:
+ recording:



BR, Hank