toUpperCase
Create upper case transformed OudsAnnotatedString.
The uppercase sometimes maps different number of characters. This function adjusts the text style and paragraph style ranges to transformed offset.
Note, if the style's offset is middle of the uppercase mapping context, this function won't transform the character, e.g. style starts from between base alphabet character and accent character.
Return
An uppercase transformed string.
Parameters
localeList
A locale list used for upper case mapping. Only the first locale is effective. If empty locale list is passed, use the current locale instead.