[Bug 51553] New: Purple bitmap should be transparent in scrollbar theming

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51553

Bug ID: 51553
           Summary: Purple bitmap should be transparent in scrollbar
                    theming
           Product: Wine
           Version: 6.13
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: gdi32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 70396
  --> https://bugs.winehq.org/attachment.cgi?id=70396
Scrollbar in WINE using a theme

A weird purple colour appeared at the center of a seekbar as I applied a custom
theme. From what I know, they're used for transparency as bitmaps doesn't
support transparency like PNGs. It's transparent in Windows XP as well.