Material type dropdown - duplicating elements

[Héctor Priori]

Material type dropdown duplicates elements after selectin an element. Duplicated elements are append at botton list.

1.- Create a new materia 2.- Open new material 3.- Select a diferent option on material type dropdown. 4.- Repeat step 3 several times

See attacked file, dropdown scroll bar show that there are a lot of elements on dropdown list.

[Aliaksandr Brui]

fixed in the version 0.8.5