From 0c879a72c53e7486678188d568fa54861061898e Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Tue, 4 Apr 2017 22:47:03 +0200
Subject: [PATCH] CompletionResultSet/CamelHumpMatcher: reuse existing objects
 when possible instead of copying

---
 .../codeInsight/completion/impl/CamelHumpMatcher.java       | 4 ++++
 .../codeInsight/completion/impl/CompletionServiceImpl.java  | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CamelHumpMatcher.java b/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CamelHumpMatcher.java
index 9b59c4a6ece0..790ad4a886a4 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CamelHumpMatcher.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CamelHumpMatcher.java
@@ -87,6 +87,10 @@ public class CamelHumpMatcher extends PrefixMatcher {
   @Override
   @NotNull
   public PrefixMatcher cloneWithPrefix(@NotNull final String prefix) {
+    if (prefix.equals(myPrefix)) {
+      return this;
+    }
+    
     return new CamelHumpMatcher(prefix, myCaseSensitive);
   }
 
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CompletionServiceImpl.java b/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CompletionServiceImpl.java
index 8cc3b5f3004e..944eb1786047 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CompletionServiceImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/completion/impl/CompletionServiceImpl.java
@@ -143,6 +143,10 @@ public final class CompletionServiceImpl extends CompletionService {
     @Override
     @NotNull
     public CompletionResultSet withPrefixMatcher(@NotNull final PrefixMatcher matcher) {
+      if (matcher.equals(getPrefixMatcher())) {
+        return this;
+      }
+      
       return new CompletionResultSetImpl(getConsumer(), myLengthOfTextBeforePosition, matcher, myContributor, myParameters, mySorter, this);
     }
 
@@ -160,7 +164,7 @@ public final class CompletionServiceImpl extends CompletionService {
     @Override
     @NotNull
     public CompletionResultSet withPrefixMatcher(@NotNull final String prefix) {
-      return withPrefixMatcher(new CamelHumpMatcher(prefix));
+      return withPrefixMatcher(getPrefixMatcher().cloneWithPrefix(prefix));
     }
 
     @NotNull