TextArea autoSize does not account for word-spacing #209

The textarea used to measure autoSize does not copy word-spacing. With custom word spacing, it can measure fewer lines than the visible textarea and leave it too short.

For example, text in a 280px textarea with 16px monospace font, 24px line height and 8px word-spacing needs three lines, but the calculation returns a two-line height.

Adding word-spacing to SIZING_STYLE changes the measured height from 58px to 82px in this case.