From 7865c327276d4eb7d97f431cc4b64b60f5894adb Mon Sep 17 00:00:00 2001
From: Antonio Scandurra <me@as-cii.com>
Date: Thu, 3 Feb 2022 11:22:55 +0100
Subject: [PATCH] Optimize `summaries_for_anchors` when `MultiBuffer` is a
 singleton

---
 crates/editor/src/multi_buffer.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/crates/editor/src/multi_buffer.rs b/crates/editor/src/multi_buffer.rs
index 2bdf819956..1904e00edc 100644
--- a/crates/editor/src/multi_buffer.rs
+++ b/crates/editor/src/multi_buffer.rs
@@ -1543,6 +1543,13 @@ impl MultiBufferSnapshot {
         D: TextDimension + Ord + Sub<D, Output = D>,
         I: 'a + IntoIterator<Item = &'a Anchor>,
     {
+        if let Some(excerpt) = self.as_singleton() {
+            return excerpt
+                .buffer
+                .summaries_for_anchors(anchors.into_iter().map(|a| &a.text_anchor))
+                .collect();
+        }
+
         let mut anchors = anchors.into_iter().peekable();
         let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
         let mut summaries = Vec::new();