[text] Proposal: contextual spacing of paragraphs

The margin-bottom attribute of a paragraph and the margin-top attribute of the next paragraph are ignored, so that the space between the paragraphs is zero, if all of the following conditions hold: The style:contextual-spacing attribute of both paragraphs has the value "true." The paragraphs belong to the same content area. The text:style-name attribute of the paragraphs refer to the same common paragraph style. In case a text:style-name attribute refers to an automatic style, the value of the style:parent-style-name attribute of the automatic style is taken for the style comparison. In case a paragraph has a conditional style, the value of its text:cond-style-name is taken for the style comparison. The default value for this attribute is false . plus these schema changes:   <define name="style-paragraph-properties-attlist"> <interleave> <optional> <attribute name="style:contextual-spacing"> <ref name="boolean"/> </attribute> </optional> </interleave> </define>