[Bug 60361] New: WritePrivateProfileSectionW incompatibility: Deleting value-only entries instead of Key=Value pairs

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60361

            Bug ID: 60361
           Summary: WritePrivateProfileSectionW incompatibility: Deleting
                    value-only entries instead of Key=Value pairs
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

About the bug:

It's simple!

`WritePrivateProfileSectionW` deletes lines that contain only a value.
On Windows, however, such lines are preserved and are not deleted.

```ini
[Section]
Key=Value
ValueOnly
Key2=Value2
```

https://gitlab.winehq.org/wine/wine/-/blob/wine-11.0/dlls/kernel32/profile.c...

Could this be considered undefined behavior?

However, this behavior is causing an actual issue:

https://appdb.winehq.org/objectManager.php?sClass=application&iId=10261

This game writes the following to `eco.ini`:

```ini
[CheckECO]
OK
```

It then uses this entry to verify that everything is working correctly. Because
the `OK` line gets removed, the check fails and the game's settings are reset
every time.

I would appreciate it if Wine's behavior could be made consistent with Windows.

Reproduce:

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

int main(void)
{
    static const WCHAR filename[] = L".\\profile-repro.ini";
    static const WCHAR section[] = L"Section";

    /* Double-NUL-terminated list required by WritePrivateProfileSectionW(). */
    static const WCHAR data[] =
        L"Key=Value\0"
        L"ValueOnly\0"
        L"Key2=Value2\0";

    HANDLE file;
    char buffer[1024];
    DWORD bytes_read;

    DeleteFileW(filename);

    if (!WritePrivateProfileSectionW(section, data, filename))
    {
        fprintf(stderr, "WritePrivateProfileSectionW failed: %lu\n",
                GetLastError());
        return 1;
    }

    file = CreateFileW(filename, GENERIC_READ,
                       FILE_SHARE_READ | FILE_SHARE_WRITE,
                       NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (file == INVALID_HANDLE_VALUE)
    {
        fprintf(stderr, "CreateFileW failed: %lu\n", GetLastError());
        return 1;
    }

    if (!ReadFile(file, buffer, sizeof(buffer) - 1, &bytes_read, NULL))
    {
        fprintf(stderr, "ReadFile failed: %lu\n", GetLastError());
        CloseHandle(file);
        return 1;
    }

    CloseHandle(file);
    buffer[bytes_read] = '\0';

    printf("ValueOnly preserved: %s\n",
           strstr(buffer, "ValueOnly") ? "yes" : "no");

    printf("\nGenerated file:\n%s", buffer);

    return 0;
}
```

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