Set the whiteSpace flag outside the grapheme and the line breaking loop

Set the whiteSpace flag outside the grapheme and the line breaking loop

The white spaces determination doesn't belong to the text breaking algorithm.
A proper breaking implementation shouldn't assume spaces are
break opportunities (actually, space is allowed to be a grapheme base);
However, the whiteSpace flag should never be checked alone while iterating
over the text to find the space sequence; the grapheme boundaries should always
be taken into account. This covers the SMP code points in UTF-16 text and
graphemes that consist of a space followed with one or more grapheme extenders.

This introduces a minor overhead that would be eliminated some later.

Change-Id: Ic2cc7f485631fd0b436fc256ce112ded5f94fc07
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>