Double column width character written wrongly after refresh

[Mitsuru Chinen]

Hello,

Thanks so much for fixing the former setcchar problem.
This time, I'd like to report another problem.

After refresh() is called, a double column character is
written at wrong place when it is written next to another double
column character.

The following sample program is reproduce this problem.
  http://www.openi18n.org/~chinen/fullwidth.c.gz

And the following animation gif shows the problem.
  http://www.openi18n.org/~chinen/result.gif
  
Although this program draws '#' as a background character,
this problem occurs even if it is not drawed.

Could you please look at it?

My environment is
 version : ncurses-5.3 with patches by 2003-05-24
  config : --with-shared --without-cxx --without-ada --enable-widec
   OS    : SuSE Linux 8.1 (kernel-2.4.19, glibc-2.2.5)
  Locale : en_US.UTF-8
Terminal Emulator : uxterm (included in XFree86 4.2.1)
   TERM variable  : xterm-color

Thank you,
-------
Mitsuru Chinen
// AP Linux Technology Center, 
// Yamato Software Lab., SWG, IBM;