Only save "NextPageDetailsInSequence" and "TransitionProperties" info…

… when needed

src/org/daisy/dotify/formatter/impl/page/PageSequenceBuilder2.java

@@ -273,7 +273,9 @@ private PageImpl nextPageInner(int pageNumberOffset, boolean hyphenateLastLine,
 			// previous page to the BlockLineLocation of the last line of the previous page. This
 			// info is used (in the next iteration) in SheetDataSource to obtain info about the
 			// verso page of a sheet when we are on a recto page of that sheet.
-			blockContext.getRefs().setNextPageDetailsInSequence(pcbl, current.getDetails());
+			if (transitionContent.isPresent() && transitionContent.get().getType()==TransitionContent.Type.INTERRUPT) {
+				blockContext.getRefs().setNextPageDetailsInSequence(pcbl, current.getDetails());
+			}
 		}
 		if (nextEmpty) {
 			nextEmpty = false;
@@ -477,7 +479,9 @@ private PageImpl nextPageInner(int pageNumberOffset, boolean hyphenateLastLine,
 					// Determine whether there is a block boundary on the page, with enough space
 					// available after this point for sequence-interrupted and any-interrupted.
 					boolean hasBlockBoundary = blockBoundary.isPresent()?blockBoundary.get():res.getHead().stream().filter(r->r.isLastRowGroupInBlock()).findFirst().isPresent();
-					bc.getRefs().keepTransitionProperties(current.getDetails().getPageLocation(), new TransitionProperties(current.getAvoidVolumeBreakAfter(), hasBlockBoundary));
+					if (transitionContent.isPresent() && transitionContent.get().getType()==TransitionContent.Type.INTERRUPT) {
+						bc.getRefs().keepTransitionProperties(current.getDetails().getPageLocation(), new TransitionProperties(current.getAvoidVolumeBreakAfter(), hasBlockBoundary));
+					}
 				}
 				// Discard collapsed margins, but retain their properties (identifiers, markers,
 				// keep-with-next-sheets, keep-with-previous-sheets).