Add support for running profiles from Add tab menu as admin without a…

… keyboard (#15679)

## Summary of the Pull Request
Add support for running profiles in the Add Tab drop down as
administrator without a keyboard.
## References and Relevant Issues
#14517 
## Detailed Description of the Pull Request / Additional comments
This pull request adds a FlyoutMenu to each Profile entry in the Add New
tab drop down. When a profile is right clicked or held for 2 seconds in
the case of no mouse input will present a MenuItem to allow the user to
click and run the selected profile as administrator
## Validation Steps Performed
- Responds to pointer input events (mouse, pointer, touchpad)
- Adjusts to theme changes.
- Only shows when a profile is selected. Will not show on settings or
pallete entries

## PR Checklist
- [x] Closes #14517 
- [ ] Tests added/passed
- [ ] Documentation updated
- If checked, please file a pull request on [our docs
repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
- [ ] Schema updated (if necessary)

src/cascadia/TerminalApp/Resources/en-US/Resources.resw

@@ -216,7 +216,7 @@
   </data>
   <data name="SearchWebText" xml:space="preserve">
     <value>Web Search</value>
-  </data>  
+  </data>
   <data name="TabColorChoose" xml:space="preserve">
     <value>Color...</value>
   </data>
@@ -836,4 +836,8 @@
   <data name="MoveTabToNewWindowToolTip" xml:space="preserve">
     <value>Moves tab to a new window </value>
   </data>
-</root>
+  <data name="RunAsAdminFlyout.Text" xml:space="preserve">
+    <value>Run as Administrator</value>
+    <comment>This text is displayed on context menu for profile entries in add new tab button.</comment>
+  </data>
+</root>

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1057,6 +1057,15 @@ namespace winrt::TerminalApp::implementation
             }
         });
 
+        // Using the static method on the base class seems to do what we want in terms of placement.
+        WUX::Controls::Primitives::FlyoutBase::SetAttachedFlyout(profileMenuItem, _CreateRunAsAdminFlyout(profileIndex));
+
+        // Since we are not setting the ContextFlyout property of the item we have to handle the ContextRequested event
+        // and rely on the base class to show our menu.
+        profileMenuItem.ContextRequested([profileMenuItem](auto&&, auto&&) {
+            WUX::Controls::Primitives::FlyoutBase::ShowAttachedFlyout(profileMenuItem);
+        });
+
         return profileMenuItem;
     }
 
@@ -4959,4 +4968,42 @@ namespace winrt::TerminalApp::implementation
         // _RemoveTab will make sure to null out the _stashed.draggedTab
         _RemoveTab(*_stashed.draggedTab);
     }
+
+    /// <summary>
+    /// Creates a sub flyout menu for profile items in the split button menu that when clicked will show a menu item for
+    /// Run as Administrator
+    /// </summary>
+    /// <param name="profileIndex">The index for the profileMenuItem</param>
+    /// <returns>MenuFlyout that will show when the context is request on a profileMenuItem</returns>
+    WUX::Controls::MenuFlyout TerminalPage::_CreateRunAsAdminFlyout(int profileIndex)
+    {
+        // Create the MenuFlyout and set its placement
+        WUX::Controls::MenuFlyout profileMenuItemFlyout{};
+        profileMenuItemFlyout.Placement(WUX::Controls::Primitives::FlyoutPlacementMode::BottomEdgeAlignedRight);
+
+        // Create the menu item and an icon to use in the menu
+        WUX::Controls::MenuFlyoutItem runAsAdminItem{};
+        WUX::Controls::FontIcon adminShieldIcon{};
+
+        adminShieldIcon.Glyph(L"\xEA18");
+        adminShieldIcon.FontFamily(Media::FontFamily{ L"Segoe Fluent Icons, Segoe MDL2 Assets" });
+
+        runAsAdminItem.Icon(adminShieldIcon);
+        runAsAdminItem.Text(RS_(L"RunAsAdminFlyout/Text"));
+
+        // Click handler for the flyout item
+        runAsAdminItem.Click([profileIndex, weakThis{ get_weak() }](auto&&, auto&&) {
+            if (auto page{ weakThis.get() })
+            {
+                NewTerminalArgs args{ profileIndex };
+                args.Elevate(true);
+                page->_OpenNewTerminalViaDropdown(args);
+            }
+        });
+
+        profileMenuItemFlyout.Items().Append(runAsAdminItem);
+
+        return profileMenuItemFlyout;
+    }
+
 }

src/cascadia/TerminalApp/TerminalPage.h

@@ -532,7 +532,7 @@ namespace winrt::TerminalApp::implementation
         void _ContextMenuOpened(const IInspectable& sender, const IInspectable& args);
         void _SelectionMenuOpened(const IInspectable& sender, const IInspectable& args);
         void _PopulateContextMenu(const IInspectable& sender, const bool withSelection);
-
+        winrt::Windows::UI::Xaml::Controls::MenuFlyout _CreateRunAsAdminFlyout(int profileIndex);
 #pragma region ActionHandlers
         // These are all defined in AppActionHandlers.cpp
 #define ON_ALL_ACTIONS(action) DECLARE_ACTION_HANDLER(action);