[Bug 59257] New: RTF clipboard reads randomly chosen string (regression from wine 10)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59257

            Bug ID: 59257
           Summary: RTF clipboard reads randomly chosen string (regression
                    from wine 10)
           Product: Wine
           Version: 11.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

After placing text on the X11 clipboard from Emacs 29.3 in Ubuntu 24.04 LTS and
attempting to paste this into a Windows program that is set to read RTF
clipboard when available, the Windows program alternately comes out with
"emacs" or my full name or some other string, none of which are what I put on
the clipboard.

The code below minimally demonstrates the issue.  Use `i686-w64-mingw32-gcc
test.c` and `wine a.exe` after placing some text onto the clipboard from Emacs.
 This works correctly in WINE 10 but fails in WINE 11, potentially feeding
randomly-chosen private strings to the Windows program instead (I was unable to
figure out how it got my full name when this was not on the clipboard, but it's
clearly somehow reading from some part of memory it shouldn't).

```c
#include <windows.h>
#include <stdio.h>

int main() {
    UINT cfRtf = RegisterClipboardFormat(TEXT("Rich Text Format"));

    if (!OpenClipboard(NULL)) {
        printf("Failed to open clipboard\n");
        return 1;
    }

    if (IsClipboardFormatAvailable(cfRtf)) {
        HANDLE hData = GetClipboardData(cfRtf);
        if (hData) {
            char* data = (char*)GlobalLock(hData);
            if (data) {
                printf("RTF clipboard contains: '%s'\n", data);
                GlobalUnlock(hData);
            }
        } else {
            printf("GetClipboardData failed\n");
        }
    } else {
        printf("RTF format not available\n");
    }

    CloseClipboard();
    return 0;
}
```

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