ES_MIXED
As explained, this style is for a mixed string that may subsequently be
converted from a PC code page to a host code page. By the conversion, the
string may get longer. How much longer depends on how many transitions from
SBCS to DBCS exist within the mixed string. (See Data
Exchange with Host for more information.) The expected length after
the conversion is called virtual length in this section for short.
WM_CHAR
If the virtual length exceeds the text
length limit, an alarm sounds and the character is ignored.
EM_PASTE
If the virtual length exceeds the text length limit,
an alarm sounds and the text is ignored.
WM_SETWINDOWPARMS
WM_SETTEXTLIMIT
If the newly set text limit is shorter than the
virtual length of the text, the text is truncated so that the virtual length
of the truncated text satisfies the limit.
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