[Bug 51802] New: Theming on 16-bit application breaks their UI

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51802

            Bug ID: 51802
           Summary: Theming on 16-bit application breaks their UI
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: uxtheme
          Assignee: wine-bugs at winehq.org
          Reporter: clinton at concernednetizen.com
      Distribution: ---

Created attachment 70689
  --> https://bugs.winehq.org/attachment.cgi?id=70689
Collins Dictionary

I noticed a regression a few months ago in a 16-bit application I regularly
run. It started when the Windows XP-style UI themes started being applied.

In the screenshot you can see the Collins English Dictionary application as it
currently runs, with a "Plastik"-style UXTHEME drawing the applications buttons
(ignore the buttons being cut-off by the windows size. That problem already
occured before the UXTHEME breakage).

The buttons are selected, but not activated do not work when clicked. The only
way to use the buttons is to click on them to highlight/select them and then
press the Enter key. This is also true of some, but not all of the buttons in
modal dialogs.

The mostly-black background of the definition display is also a new bug which
occurred simultaneously to moment UXTHEMEs became applicable to 16-bit apps. It
seems like the definitions, when drawn to the screen, do not blank out what
preceeded them, so smaller definitions overlap the former larger ones.

The software can be easily downloaded here for testing:
https://archive.org/details/collins_win31

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