https://bugs.winehq.org/show_bug.cgi?id=42740
Bug ID: 42740 Summary: Icons with transparency no longer rendering correctly Product: Wine Version: 2.4 Hardware: x86-64 OS: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: -unknown Assignee: wine-bugs@winehq.org Reporter: wine@sagagames.de Distribution: ---
Using Wine 2.4 on Xubuntu 16.10, icons in OpenMPT (https://openmpt.org/) no longer have a transparent background. They all render with a white background and even some bogus pixels, indicating that the 8-bit alpha is ignored completely.
They were rendered correctly on Wine 2.0 the last time I checked.