Creates an editable field with one or more lines.
Since IUP 3.0, IupText has support for multiple lines when the MULTILINE attribute is set to YES. Now when a IupMultiline element is created in fact a IupText element with MULTILINE=YES is created.
See IupText
Ihandle* IupMultiLine(const char *action); [in C]
iup.multiline{} -> (ih: ihandle) [in Lua]
multiline(action) [in LED]
action: name of the action generated when the user types something. It can be NULL.
Returns: the identifier of the created element, or NULL if an error occurs.