Reload environment variables by default; add setting to disable

doc/cascadia/profiles.schema.json

@@ -2164,6 +2164,11 @@
           "description": "When set to true, the background image for the currently focused profile is expanded to encompass the entire window, beneath other panes.",
           "type": "boolean"
         },
+        "compatibility.reloadEnvironmentVariables": {
+          "default": true,
+          "description": "When set to true, when opening a new tab or pane it will get reloaded environment variables.",
+          "type": "boolean"
+        },
         "initialCols": {
           "default": 120,
           "description": "The number of columns displayed in the window upon first load. If \"launchMode\" is set to \"maximized\" (or \"maximizedFocus\"), this property is ignored.",

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1318,6 +1318,8 @@ namespace winrt::TerminalApp::implementation
                                                                                  winrt::guid());
 
             valueSet.Insert(L"passthroughMode", Windows::Foundation::PropertyValue::CreateBoolean(settings.VtPassthrough()));
+            valueSet.Insert(L"reloadEnvironmentVariables",
+                            Windows::Foundation::PropertyValue::CreateBoolean(_settings.GlobalSettings().ReloadEnvironmentVariables()));
 
             conhostConn.Initialize(valueSet);
 

src/cascadia/TerminalConnection/ConptyConnection.cpp

@@ -11,6 +11,7 @@
 #include "LibraryResources.h"
 #include "../../types/inc/Environment.hpp"
 #include "../../types/inc/utils.hpp"
+#include <til/env.h>
 
 #include "ConptyConnection.g.cpp"
 
@@ -95,7 +96,20 @@ namespace winrt::Microsoft::Terminal::TerminalConnection::implementation
         });
 
         // Populate the environment map with the current environment.
-        RETURN_IF_FAILED(Utils::UpdateEnvironmentMapW(environment));
+        if (_reloadEnvironmentVariables)
+        {
+            til::env refreshedEnvironment;
+            refreshedEnvironment.regenerate();
+
+            for (const auto& [key, value] : refreshedEnvironment.as_map())
+            {
+                environment.try_emplace(std::move(key), std::move(value));
+            }
+        }
+        else
+        {
+            RETURN_IF_FAILED(Utils::UpdateEnvironmentMapW(environment));
+        }
 
         {
             // Convert connection Guid to string and ignore the enclosing '{}'.
@@ -272,6 +286,8 @@ namespace winrt::Microsoft::Terminal::TerminalConnection::implementation
             {
                 _passthroughMode = winrt::unbox_value_or<bool>(settings.TryLookup(L"passthroughMode").try_as<Windows::Foundation::IPropertyValue>(), _passthroughMode);
             }
+            _reloadEnvironmentVariables = winrt::unbox_value_or<bool>(settings.TryLookup(L"reloadEnvironmentVariables").try_as<Windows::Foundation::IPropertyValue>(),
+                                                                      _reloadEnvironmentVariables);
         }
 
         if (_guid == guid{})

src/cascadia/TerminalConnection/ConptyConnection.h

@@ -89,6 +89,7 @@ namespace winrt::Microsoft::Terminal::TerminalConnection::implementation
         std::wstring _u16Str{};
         std::array<char, 4096> _buffer{};
         bool _passthroughMode{};
+        bool _reloadEnvironmentVariables{};
 
         struct StartupInfoFromDefTerm
         {

src/cascadia/TerminalSettingsModel/GlobalAppSettings.idl

@@ -79,6 +79,7 @@ namespace Microsoft.Terminal.Settings.Model
         INHERITABLE_SETTING(Boolean, ForceFullRepaintRendering);
         INHERITABLE_SETTING(Boolean, SoftwareRendering);
         INHERITABLE_SETTING(Boolean, UseBackgroundImageForWindow);
+        INHERITABLE_SETTING(Boolean, ReloadEnvironmentVariables);
         INHERITABLE_SETTING(Boolean, ForceVTInput);
         INHERITABLE_SETTING(Boolean, DebugFeaturesEnabled);
         INHERITABLE_SETTING(Boolean, StartOnUserLogin);

src/cascadia/TerminalSettingsModel/MTSMSettings.h

@@ -27,6 +27,7 @@ Author(s):
     X(bool, ForceFullRepaintRendering, "experimental.rendering.forceFullRepaint", false)                                                                   \
     X(bool, SoftwareRendering, "experimental.rendering.software", false)                                                                                   \
     X(bool, UseBackgroundImageForWindow, "experimental.useBackgroundImageForWindow", false)                                                                \
+    X(bool, ReloadEnvironmentVariables, "compatibility.reloadEnvironmentVariables", true)                                                                  \
     X(bool, ForceVTInput, "experimental.input.forceVT", false)                                                                                             \
     X(bool, TrimBlockSelection, "trimBlockSelection", true)                                                                                                \
     X(bool, DetectURLs, "experimental.detectURLs", true)                                                                                                   \