Name: anR10225 Date: 07/11/2003


    The following three methods of javax.swing.text.Utilities class
which are intensively used during text components layout and
painting could be optimized and made more correct :
    . getTabbedTextWidth
    . drawTabbedText
    . getTabbedTextOffset
Their current implementations calculate the width of a substring
by summing length of its composing characters. This is
    . inefficient: calculating the width by a single invocation of
      FontMetrics.getCharsWidth(char[], int, int) is 20% - 50%
      faster than invocation of FontMetrics.getCharWidth(char)
      'length' times.
    . incorrect: theoretically a metrics may exist (see bug #4841188)
      in which width(char1) + width(char2) != width("" + char1 + char2)

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