- Use system wide caret width and height if one of those parameters is zero

- Ref: http://msdn.microsoft.com/en-us/library/ms648399(VS.85).aspx
- Allows to show the caret in riched20a components (Wordpad f.e.)
See issue #1559 for more details.

svn path=/trunk/; revision=42313

reactos/subsystems/win32/win32k/ntuser/caret.c

@@ -355,6 +355,14 @@ NtUserCreateCaret(
    }
    else
    {
+      if (nWidth == 0)
+      {
+          nWidth = UserGetSystemMetrics(SM_CXBORDER);
+      }
+      if (nHeight == 0)
+      {
+          nHeight = UserGetSystemMetrics(SM_CYBORDER);
+      }
       ThreadQueue->CaretInfo->Bitmap = (HBITMAP)0;
       ThreadQueue->CaretInfo->Size.cx = nWidth;
       ThreadQueue->CaretInfo->Size.cy = nHeight;