PVS-Studio warning V512 for Miranda IM

typedef struct _textrangew
{
  CHARRANGE chrg;
  LPWSTR lpstrText;
} TEXTRANGEW;

const wchar_t* Utils::extractURLFromRichEdit(....)
{
  ...
  ::CopyMemory(tr.lpstrText, L"mailto:", 7);
  ...
}

This is what should have been written here: sizeof(wchar_t) * 7

This suspicious code was found in Miranda IM project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memcpy' function will lead to a buffer overflow or underflow. tabsrmm utils.cpp 1080

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/