Feature: Remember host list sort preference in main dialog

Persist the sort column and direction chosen via the online host list
header (list\OnlineListSort registry key) so the next launch defaults to
the same sort. Re-apply the sort when hosts come online/offline so newly
connected hosts land in their sorted position instead of appending at the
end.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.cpp

@@ -1419,6 +1419,7 @@ VOID CMy2015RemoteDlg::InitControl()
         g_Column_Online_Width+=g_Column_Data_Online[i].nWidth;
     }
     m_CList_Online.InitColumns();
+    LoadSortPreference();          // 加载上次记忆的排序偏好
     // 隐藏空标题列（内部数据槽，不允许用户拖拽显示）
     for (int i = 0; i < g_Column_Count_Online; ++i) {
         if (g_Column_Data_Online[i].szTitle[0] == '\0') {
@@ -3486,6 +3487,7 @@ void CMy2015RemoteDlg::OnTimer(UINT_PTR nIDEvent)
 
         // 虚拟列表：重建过滤索引并更新项目计数
         if (hasListChange) {
+            ApplySort();           // 有排序偏好时重排，让新上线主机落到排序位置
             RebuildFilteredIndices();
             m_CList_Online.SetItemCountExV((int)m_FilteredIndices.size(), LVSICF_NOINVALIDATEALL | LVSICF_NOSCROLL);
         }
@@ -3880,8 +3882,6 @@ void CMy2015RemoteDlg::SortByColumn(int nColumn)
     // 缩略图列点击表头不参与排序 —— 没有可比较的数据维度，避免误触发
     if (ColumnToDataSlot(nColumn) < 0) return;
 
-    static int m_nSortColumn = 0;
-    static bool m_bSortAscending = false;
     if (nColumn == m_nSortColumn) {
         // 如果点击的是同一列，切换排序顺序
         m_bSortAscending = !m_bSortAscending;
@@ -3891,8 +3891,25 @@ void CMy2015RemoteDlg::SortByColumn(int nColumn)
         m_bSortAscending = true;
     }
 
-    // 虚拟列表：对数据源进行排序（列号映射到底层数据槽）
     EnterCriticalSection(&m_cs);
+    ApplySort();
+    RebuildFilteredIndices();
+    LeaveCriticalSection(&m_cs);
+
+    // 刷新列表
+    m_CList_Online.Invalidate();
+
+    SaveSortPreference();
+}
+
+void CMy2015RemoteDlg::ApplySort()
+{
+    // 无有效排序偏好或列不合法（缩略图/越界）时保持列表原始顺序
+    if (m_nSortColumn <= COL_THUMBNAIL || m_nSortColumn >= g_Column_Count_Online) {
+        return;
+    }
+
+    // 虚拟列表：对数据源进行排序（列号映射到底层数据槽），调用方需持有 m_cs
     int slot = ColumnToDataSlot(m_nSortColumn);
     bool asc = m_bSortAscending;
     std::sort(m_HostList.begin(), m_HostList.end(),
@@ -3903,19 +3920,38 @@ void CMy2015RemoteDlg::SortByColumn(int nColumn)
             return asc ? (result < 0) : (result > 0);
         });
 
-    // 重建索引映射
+    // 排序后 clientID -> 索引映射已改变，需重建
     m_ClientIndex.clear();
     for (size_t i = 0; i < m_HostList.size(); ++i) {
         if (m_HostList[i]) {
             m_ClientIndex[m_HostList[i]->GetClientID()] = i;
         }
     }
-    // 重建过滤索引
-    RebuildFilteredIndices();
-    LeaveCriticalSection(&m_cs);
+}
 
-    // 刷新列表
-    m_CList_Online.Invalidate();
+void CMy2015RemoteDlg::LoadSortPreference()
+{
+    std::string val = THIS_CFG.GetStr("list", "OnlineListSort", "");
+    if (val.empty()) {
+        m_nSortColumn = -1;      // 无偏好：保持列表原始顺序
+        m_bSortAscending = true;
+        return;
+    }
+
+    auto arr = StringToVector(val, ',');
+    if (arr.size() >= 2) {
+        m_nSortColumn = atoi(arr[0].c_str());
+        m_bSortAscending = (atoi(arr[1].c_str()) != 0);
+    } else {
+        m_nSortColumn = -1;
+        m_bSortAscending = true;
+    }
+}
+
+void CMy2015RemoteDlg::SaveSortPreference()
+{
+    std::string val = std::to_string(m_nSortColumn) + "," + (m_bSortAscending ? "1" : "0");
+    THIS_CFG.SetStr("list", "OnlineListSort", val);
 }
 
 void CMy2015RemoteDlg::OnHdnItemclickList(NMHDR* pNMHDR, LRESULT* pResult)