From 6e5109fd46fa93335aa8bc7d5e3edb738980241f Mon Sep 17 00:00:00 2001
From: SmallJoker <SmallJoker@users.noreply.github.com>
Date: Thu, 14 Dec 2017 19:47:29 +0100
Subject: [PATCH] Chat: Remove prompt history duplicates (#6762)

---
 src/chat.cpp | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/chat.cpp b/src/chat.cpp
index a5d82a649..818e261d7 100644
--- a/src/chat.cpp
+++ b/src/chat.cpp
@@ -18,11 +18,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "chat.h"
-#include "debug.h"
-#include "config.h"
-#include "util/strfnd.h"
+
+#include <algorithm>
 #include <cctype>
 #include <sstream>
+
+#include "config.h"
+#include "debug.h"
+#include "util/strfnd.h"
 #include "util/string.h"
 #include "util/numeric.h"
 
@@ -403,8 +406,14 @@ void ChatPrompt::input(const std::wstring &str)
 
 void ChatPrompt::addToHistory(std::wstring line)
 {
-	if (!line.empty())
+	if (!line.empty() &&
+			(m_history.size() == 0 || m_history.back() != line)) {
+		// Remove all duplicates
+		m_history.erase(std::remove(m_history.begin(), m_history.end(),
+			line), m_history.end());
+		// Push unique line
 		m_history.push_back(line);
+	}
 	if (m_history.size() > m_history_limit)
 		m_history.erase(m_history.begin());
 	m_history_index = m_history.size();