Steps to reproduce:
1. Open attachment 49139 [details] from bug 39256
-> Pattern fills are displayed as solid black. See https://bug-attachments.documentfoundation.org/attachment.cgi?id=49146 for comparison
Build ID: fe855eda54faf6196ad9dea12d8dc090b6d6c1da
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3;
Locale: ca-ES (ca_ES.UTF-8); UI-Language: en-US
Version 18.104.22.168.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)
The main issue is lack of pattern support (see also "Basic Fill Patterns" rectangles.
In "Background Color" and "Transparency" objects, there are pattern with stripes.
As pattern are not implemented whole rectangle is treated as solid object.
For "Background Color" first color (color of stripes) is red and for "Transparency" it is black.
After implementing pattern support, it should work properly