Make duplicate tabs consider the existing configuration option for it…

…s insertion (microsoft#15972)

Previously, the duplication method considered only the next to the selected tab(`tab.TabViewIndex() + 1`) as the insert position. Changed that to consider the setting.

Closes microsoft#15776

src/cascadia/TerminalApp/TabManagement.cpp

@@ -301,7 +301,12 @@ namespace winrt::TerminalApp::implementation
             // In the future, it may be preferable to just duplicate the
             // current control's live settings (which will include changes
             // made through VT).
-            _CreateNewTabFromPane(_MakePane(nullptr, tab, nullptr), tab.TabViewIndex() + 1);
+            uint32_t insertPosition = _tabs.Size();
+            if (_settings.GlobalSettings().NewTabPosition() == NewTabPosition::AfterCurrentTab)
+            {
+                insertPosition = tab.TabViewIndex() + 1;
+            }
+            _CreateNewTabFromPane(_MakePane(nullptr, tab, nullptr), insertPosition);
 
             const auto runtimeTabText{ tab.GetTabText() };
             if (!runtimeTabText.empty())