paste_text
Description:
Inserts text from the system clipboard into an EditableText object.
 As with all character offsets, the specified position may not be the  same as the resulting byte offset, since the text is in a  
      variable-width encoding.
Parameters:
| this | a pointer to the EditableText object to modify. | 
| position | a int indicating the character offset at which to insert the new text. | 
Returns:
| 
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