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     The getgtextextent function returns the width, in pixels, that
     would be required to print the text string using outgtext with the
     current font.
 
     This function is particularly useful for determining the size of
     text that uses proportionally spaced fonts.
 
     Return Value
 
     The getgtextextent function returns the width in pixels. It returns
     -1 if a font has not been registered.
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