[Bug 53886] New: SendMessage(WM_GETTEXT) is implemented as Unicode instead of Ansi.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53886

Bug ID: 53886
           Summary: SendMessage(WM_GETTEXT) is implemented as Unicode
                    instead of Ansi.
           Product: Wine
           Version: 7.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

SendMessage, with WM_GETTEXT returns Unicode, instead of ANSI when targeting
other applications. This leads to unusable content, for applications expecting
ANSI.

The Windows compatibility can be anything from Win7 to Win10. The behavior is
the same on Wine's virtual desktop vs. native Linux desktop.
Also, tested on Kubuntu 32-bit and 64-bit.

Test applications (source code available):
https://github.com/VCC02/CodeExamples/blob/main/SendMessage_WM_GETTEXT/FP/Ge...
https://github.com/VCC02/CodeExamples/blob/main/SendMessage_WM_GETTEXT/FP/Ge...
https://github.com/VCC02/CodeExamples/blob/main/SendMessage_WM_GETTEXT/Delph...

Looking at the provided applications..
The "Control Text" editbox should properly display the received text, but its
content is truncated by ASCII 0.
The "Control Text [no ASCII 0]" editbox is set to display the same text, but it
removes the ASCII 0 characters before displaying, so we can see the expected
content.
Below the "Control Text [no ASCII 0]" editbox, there is a hex representation of
the received string, which shows the ASCII 0 characters after every other
character, indicating UTF-16.
Targeting the same window as the app calling SendMessage(WM_GETTEXT), results
in the expecting content. It seems, that the Unicode content is for other
windows/controls, from other applications, not the one making the call.

There are three provided executables, all seem to behave the same (FreePascal
(CodeTyphon 7.9): 32-bit and 64-bit, and Delphi 2006: 32-bit). All of the three
are compiled with no Unicode support (i.e., they call the "A" versions of the
Windows API functions, e.g. SendMessageA).

On Wine 7.16 the app may crash after a few seconds. Newer versions of Wine are
stable (7.20).

Thank you