In ASCII text format there is no formal concept of the paragraph. Despite it happens conveniently to consider as paragraphs those parts of the text which are separated from other parts of the text by the empty lines.

Text breakdown on paragraphs by this principle, is applied at performance of operations of formatting (align left, right, centre, justify). During these operations words are moving since a line for the line only within the paragraph. That is, each paragraph is formatted separately (independently). Text breakdown on paragraphs is applied also at drawing up of lists.

You should watch for correct text breakdown on paragraphs (i.e. to insert into text proper places empty lines) that TextLab worked as it is necessary for you.