允许设置去重保留较早或较晚的项

v2rayN/v2rayN/Forms/MainForm.cs

@@ -558,8 +558,7 @@ namespace v2rayN.Forms
 
         private void menuRemoveDuplicateServer_Click(object sender, EventArgs e)
         {
-            List<Mode.VmessItem> servers = null;
+            Utils.DedupServerList(config.vmess, out List<VmessItem> servers, config.keepOlderDedupl);
-            Utils.DedupServerList(config.vmess, out servers);
             int oldCount = config.vmess.Count;
             int newCount = servers.Count;
             if (servers != null)

v2rayN/v2rayN/Forms/OptionSettingForm.Designer.cs

@@ -84,6 +84,7 @@
             this.txtKcpmtu = new System.Windows.Forms.TextBox();
             this.label6 = new System.Windows.Forms.Label();
             this.tabPage7 = new System.Windows.Forms.TabPage();
+            this.chkKeepOlderDedupl = new System.Windows.Forms.CheckBox();
             this.cbFreshrate = new System.Windows.Forms.ComboBox();
             this.lbFreshrate = new System.Windows.Forms.Label();
             this.chkEnableStatistics = new System.Windows.Forms.CheckBox();
@@ -510,6 +511,7 @@
             // tabPage7
             // 
             resources.ApplyResources(this.tabPage7, "tabPage7");
+            this.tabPage7.Controls.Add(this.chkKeepOlderDedupl);
             this.tabPage7.Controls.Add(this.cbFreshrate);
             this.tabPage7.Controls.Add(this.lbFreshrate);
             this.tabPage7.Controls.Add(this.chkEnableStatistics);
@@ -520,6 +522,12 @@
             this.tabPage7.Name = "tabPage7";
             this.tabPage7.UseVisualStyleBackColor = true;
             // 
+            // chkKeepOlderDedupl
+            // 
+            resources.ApplyResources(this.chkKeepOlderDedupl, "chkKeepOlderDedupl");
+            this.chkKeepOlderDedupl.Name = "chkKeepOlderDedupl";
+            this.chkKeepOlderDedupl.UseVisualStyleBackColor = true;
+            // 
             // cbFreshrate
             // 
             resources.ApplyResources(this.cbFreshrate, "cbFreshrate");
@@ -714,5 +722,6 @@
         private System.Windows.Forms.TextBox txtuserPacRule;
         private System.Windows.Forms.Panel panel4;
         private System.Windows.Forms.Label label4;
+        private System.Windows.Forms.CheckBox chkKeepOlderDedupl;
     }
 }

v2rayN/v2rayN/Forms/OptionSettingForm.cs

@@ -112,10 +112,10 @@ namespace v2rayN.Forms
             txturlGFWList.Text = config.urlGFWList;
 
             chkAllowLANConn.Checked = config.allowLANConn;
+            chkEnableStatistics.Checked = config.enableStatistics;
+            chkKeepOlderDedupl.Checked = config.keepOlderDedupl;
 
 
-            var enableStatistics = config.enableStatistics;
-            chkEnableStatistics.Checked = enableStatistics;
 
 
             var cbSource = new ComboItem[]
@@ -343,6 +343,7 @@ namespace v2rayN.Forms
             var lastEnableStatistics = config.enableStatistics;
             config.enableStatistics = chkEnableStatistics.Checked;
             config.statisticsFreshRate = (int)cbFreshrate.SelectedValue;
+            config.keepOlderDedupl = chkKeepOlderDedupl.Checked;
 
             //if(lastEnableStatistics != config.enableStatistics)
             //{

v2rayN/v2rayN/Forms/OptionSettingForm.resx

@@ -1305,6 +1305,36 @@
   <data name="chkAllowLANConn.Text" xml:space="preserve">
     <value>Allow connections from the LAN</value>
   </data>
+  <data name="chkKeepOlderDedupl.AutoSize" type="System.Boolean, mscorlib">
+    <value>True</value>
+  </data>
+  <data name="chkKeepOlderDedupl.ImeMode" type="System.Windows.Forms.ImeMode, System.Windows.Forms">
+    <value>NoControl</value>
+  </data>
+  <data name="chkKeepOlderDedupl.Location" type="System.Drawing.Point, System.Drawing">
+    <value>15, 110</value>
+  </data>
+  <data name="chkKeepOlderDedupl.Size" type="System.Drawing.Size, System.Drawing">
+    <value>198, 16</value>
+  </data>
+  <data name="chkKeepOlderDedupl.TabIndex" type="System.Int32, mscorlib">
+    <value>33</value>
+  </data>
+  <data name="chkKeepOlderDedupl.Text" xml:space="preserve">
+    <value>Keep older when deduplication</value>
+  </data>
+  <data name="&gt;&gt;chkKeepOlderDedupl.Name" xml:space="preserve">
+    <value>chkKeepOlderDedupl</value>
+  </data>
+  <data name="&gt;&gt;chkKeepOlderDedupl.Type" xml:space="preserve">
+    <value>System.Windows.Forms.CheckBox, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </data>
+  <data name="&gt;&gt;chkKeepOlderDedupl.Parent" xml:space="preserve">
+    <value>tabPage7</value>
+  </data>
+  <data name="&gt;&gt;chkKeepOlderDedupl.ZOrder" xml:space="preserve">
+    <value>0</value>
+  </data>
   <data name="cbFreshrate.Location" type="System.Drawing.Point, System.Drawing">
     <value>161, 84</value>
   </data>

v2rayN/v2rayN/Forms/OptionSettingForm.zh-Hans.resx

@@ -369,4 +369,7 @@
   <data name="$this.Text" xml:space="preserve">
     <value>参数设置</value>
   </data>
+  <data name="chkKeepOlderDedupl.Text" xml:space="preserve">
+    <value>去重时保留序号较小的项</value>
+  </data>
 </root>

v2rayN/v2rayN/Mode/Config.cs

@@ -138,6 +138,14 @@ namespace v2rayN.Mode
             get; set;
         }
 
+        /// <summary>
+        /// 去重时优先保留较旧（顶部）节点
+        /// </summary>
+        public bool keepOlderDedupl
+        {
+            get; set;
+        }
+
         /// <summary>
         /// 视图刷新率
         /// </summary>

v2rayN/v2rayN/Tool/Utils.cs

@@ -320,10 +320,10 @@ namespace v2rayN
             return $"{string.Format("{0:f1}", result)} {unit}";
         }
 
-        public static void DedupServerList(List<Mode.VmessItem> source, out List<Mode.VmessItem> result)
+        public static void DedupServerList(List<Mode.VmessItem> source, out List<Mode.VmessItem> result, bool keepOlder)
         {
             var list = new List<Mode.VmessItem>();
-            source.Reverse(); // Remove the early items first
+            if (!keepOlder) source.Reverse(); // Remove the early items first
 
             bool _isAdded(Mode.VmessItem o, Mode.VmessItem n)
             {
@@ -348,7 +348,7 @@ namespace v2rayN
                     list.Add(item);
                 }
             }
-            list.Reverse();
+            if (!keepOlder) list.Reverse();
             result = list;
         }