no abs for int64 values with msvc

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15578 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/src/changes.C b/src/changes.C
index 6458e65733d04cf3df5a1e88c5d2d2f9ca280b3e..133c5b76aaf77b7f5897062fdef22e0d89b41ce7 100644 (file)
--- a/src/changes.C
+++ b/src/changes.C
@@ -50,7 +50,7 @@ bool operator==(Change const & l, Change const & r)
 
        return l.author == r.author
               // both changes made within 5 minutes?
-              && abs(static_cast<int>(l.changetime - r.changetime)) < 300;
+              && abs(difftime(l.changetime, r.changetime)) < 300;
 }