Fix removing next link during strip whitespaces for first element. #1790
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This PR fix my issue #1778 .
The main problem this we shouldn't change the link to the next element after remove first when we have forward motion it's actual for reverse motion only.
By current code logic next state:
elem1 -> elem2
elem2 -> elem3
elem3 -> null
changed to:
elem2 -> null
elem3 -> null
(we removed first element and for second element set next link as null)