Ensure export and find tab context menu items work for unfocused tabs (…

…#14673)

## Summary of the Pull Request
Updates the tab event handling so that the "Export Text" and "Find" tab context menu items work when a tab isn't focused.

## PR Checklist
* [x] Closes #13948
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] 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.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

## Validation Steps Performed
Manually tested.

src/cascadia/TerminalApp/AppActionHandlers.cpp

@@ -510,7 +510,10 @@ namespace winrt::TerminalApp::implementation
     void TerminalPage::_HandleFind(const IInspectable& /*sender*/,
                                    const ActionEventArgs& args)
     {
-        _Find();
+        if (const auto activeTab{ _GetFocusedTabImpl() })
+        {
+            _Find(*activeTab);
+        }
         args.Handled(true);
     }
 

src/cascadia/TerminalApp/TabManagement.cpp

@@ -194,9 +194,9 @@ namespace winrt::TerminalApp::implementation
 
             if (page && tab)
             {
-                // Passing null args to the ExportBuffer handler will default it
-                // to prompting for the path
-                page->_HandleExportBuffer(nullptr, nullptr);
+                // Passing empty string as the path to export tab will make it
+                // prompt for the path
+                page->_ExportTab(*tab, L"");
             }
         });
 
@@ -206,7 +206,8 @@ namespace winrt::TerminalApp::implementation
 
             if (page && tab)
             {
-                page->_Find();
+                page->_SetFocusedTab(*tab);
+                page->_Find(*tab);
             }
         });
 

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -3160,15 +3160,15 @@ namespace winrt::TerminalApp::implementation
 
     // Method Description:
     // - Called when the user tries to do a search using keybindings.
-    //   This will tell the current focused terminal control to create
-    //   a search box and enable find process.
+    //   This will tell the active terminal control of the passed tab
+    //   to create a search box and enable find process.
     // Arguments:
-    // - <none>
+    // - tab: the tab where the search box should be created
     // Return Value:
     // - <none>
-    void TerminalPage::_Find()
+    void TerminalPage::_Find(const TerminalTab& tab)
     {
-        if (const auto& control{ _GetActiveControl() })
+        if (const auto& control{ tab.GetActiveTerminalControl() })
         {
             control.CreateSearchBoxControl();
         }

src/cascadia/TerminalApp/TerminalPage.h

@@ -388,7 +388,7 @@ namespace winrt::TerminalApp::implementation
         void _OnCommandLineExecutionRequested(const IInspectable& sender, const winrt::hstring& commandLine);
         void _OnSwitchToTabRequested(const IInspectable& sender, const winrt::TerminalApp::TabBase& tab);
 
-        void _Find();
+        void _Find(const TerminalTab& tab);
 
         winrt::Microsoft::Terminal::Control::TermControl _InitControl(const winrt::Microsoft::Terminal::Settings::Model::TerminalSettingsCreateResult& settings,
                                                                       const winrt::Microsoft::Terminal::TerminalConnection::ITerminalConnection& connection);