DiffContent (@NotNull RevisionProcessingProgress p) { Entry leftEntry = getLeftEntry(); if (leftEntry == null) return DiffContentFactory.getInstance().createEmpty(); if (isLeftContentAvailable(p)) { DiffContent content = getReadOnlyLeftDiffContent(p); if (content != null) return content; } return DiffContentFactory.getInstance().create(LocalHistoryBundle.message("content.not.available")); }