xdiff: implement empty line chunk heuristic

diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index c0339919ccf78c4fe7d78123f9c3e891075d0602..d1dbb2750acb9da8f6e61d71ce4e51e689e6ae88 100644 (file)
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -41,6 +41,8 @@ extern "C" {
 
 #define XDF_IGNORE_BLANK_LINES (1 << 7)
 
+#define XDF_COMPACTION_HEURISTIC (1 << 8)
+
 #define XDL_EMIT_FUNCNAMES (1 << 0)
 #define XDL_EMIT_COMMON (1 << 1)
 #define XDL_EMIT_FUNCCONTEXT (1 << 2)