From c9be6730f6be1f9baa14ff8d946f58b0b554dcff Mon Sep 17 00:00:00 2001
From: Jason Felice <jason.m.felice@gmail.com>
Date: Mon, 8 Mar 2021 15:26:38 -0500
Subject: [PATCH] Binary search for first range to change

---
 src/changes.hh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/changes.hh b/src/changes.hh
index 5ebb3ded..9d0328d4 100644
--- a/src/changes.hh
+++ b/src/changes.hh
@@ -53,8 +53,10 @@ void update_forward(ConstArrayView<Buffer::Change> changes, RangeContainer& rang
             changes_tracker.update(*it++);
     };
 
-    for (auto& range : ranges)
-        update_range(changes_tracker, range, advance_while_relevant);
+    auto range_it = std::lower_bound(ranges.begin(), ranges.end(), changes.front(),
+                                     [](auto& range, const Buffer::Change& change) { return get_last(range) < change.begin; });
+    for (auto end = ranges.end(); range_it != end; ++range_it)
+        update_range(changes_tracker, *range_it, advance_while_relevant);
 }
 
 template<typename RangeContainer>