Initialize JTableHeader properties, e.g. font, foreground, and background.
The font, foreground, and background properties are only set if their
current value is either null or a UIResource, other properties are set
if the current value is null.
Return the preferred size of the header. The preferred height is the
maximum of the preferred heights of all of the components provided
by the header renderers. The preferred width is the sum of the
preferred widths of each column (plus inter-cell spacing).
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