fnGetHeaderFont = function() {
			if (!sHeaderFont) {
				sHeaderFont = [ThemeParameters.get({ name: "sapUiColumnHeaderFontWeight" }) || "normal", sDefaultFont].join(" ");
			}
			return sHeaderFont;
		}
Calculates the width of the column header width according to calculated cell content and min/max width restrictions.

@param {string} sHeader The header text
@param {float} [fContentWidth] The calculated width of the cell in rem
@param {int} [iMaxWidth=19] The maximum header width in rem
@param {int} [iMinWidth=2] The minimum header width in rem
@param {boolean} [bRequired=false] Determines whether the given column header is marked as required
@param {boolean} [bHasAction=false] Whether there is an action button on the column header
@returns {float} The calculated header width in rem
@private
@ui5-restricted sap.ui.comp