[PDF print] Font color ignored (white > black)

[franzrogar]

OS: Windows 8.1 SP3 up-to-date
Inkscape: 0.92.1 x32 & x64 (official build)
PDF viewer: Adobe Acrobat XI Pro up-to-date
Printer: Brother MFC-j220 (laser printer), drivers & bios up-to-date

Problem: Some text (white color) prints as black color, while other remains proper (printed as white).

History:
- The original document was created using a pre 0.9x branch.
- Edited directly in 0.92.1 with the option to "scale" from 90 to 96 ppp.
- If the text is grouped (see attached file) some text objects prints from PDF as black text and other don't.
- If the text is ungrouped (see attached file) all text objects prints from PDF correctly.
- In both cases (grouped & ungrouped) the generated PDF shows the text as white properly (see attached files).

Reproducibility:
- New text layers created directly in 0.92.1 don't suffer from this issue.

[franzrogar (franzrogar)]

File: Source SVG object without grouping, printing OK (in white).

[franzrogar (franzrogar)]

File: Inkscape converted PDF in my PC (bug).

[franzrogar (franzrogar)]

File: Inkscape converted PDF in my PC (printing OK).