private int findKerningAmount(int newLineLastChar, int nextChar) {
        BitmapCharacter c = charSet.getCharacter(newLineLastChar);
        if (c == null)
            return 0;
        return c.getKerning(nextChar);
    }
Gets the line height of a StringBlock.

@param sb the block to measure (not null, unaffected)
@return the line height
jme3-core/src/main/java/com/jme3/font/BitmapFont.java