boolean (int offset, @NotNull FoldRegionImpl region, boolean atStart, @NotNull Collection<? extends FoldRegionImpl> overlapping) { if (atStart) { if (lastCollapsedRegion == null || region.getEndOffset() > lastCollapsedRegion.getEndOffset() || region instanceof CustomFoldRegion && region.getStartOffset() == lastCollapsedRegion.getStartOffset() && region.getEndOffset() == lastCollapsedRegion.getEndOffset()) { if (!region.isExpanded()) { hideContainedRegions(region); lastCollapsedRegion = region; } visible.add(region); } } return true; }