[fixed] material icon color

[Hank]

Hi there,

when you click on material color icon (instead of material text) as shown below:



you get this:

Dump written 2019-1-3_21-30
Version: 2.2.1
OS: Windows 8 (build 9200), 64-bit edition
GPU: Intel | Intel® HD Graphics 520
Window: geom
Reason: function_clause

Short stack trace:
[{wings_material,command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_material.erl"},
{line,72}]},
{wings_develop,time_command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_develop.erl"},
{line,87}]},
{wings,raw_command,4,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,625}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,982}]},
{wings_wm,send_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,948}]},
{wings_wm,do_dispatch,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,849}]},
{wings_wm,dispatch_event,1,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,758}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,657}]},
{wings,init_part2,2,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,106}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

BR, Hank