Add find item to tab menu (#13055)

## Summary of the Pull Request

Add `Find` to tab context menu as describe in issue #5633.

## PR Checklist
* [x] Closes #5633
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA

## Detailed Description of the Pull Request / Additional comments

Just wanted to solve `Easy Starter` issue, so any corrections/suggestions welcome. There's a couple of points I'm not sure of
* Placement of item within menu, currently it's at the end before close tab block.
* Should it be named longer, something like `Find in Tab` of just `Find` is fine?
* The workaround for focus similar to tab rename is a bit annoying, especially because it required adding a method to `TermControl` but without it find window obviously opens without focus which is bad.

## Validation Steps Performed

Open menu, press menu item try to find things via opened find dialog.

(cherry picked from commit b851b0d)
Service-Card-Id: 83524184
Service-Version: 1.14

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

@@ -709,6 +709,9 @@
   <data name="ExportSuccess" xml:space="preserve">
     <value>Successfully exported terminal content</value>
   </data>
+  <data name="FindText" xml:space="preserve">
+    <value>Find</value>
+  </data>
   <data name="PlainText" xml:space="preserve">
     <value>Plain Text</value>
   </data>

src/cascadia/TerminalApp/TabManagement.cpp

@@ -209,6 +209,16 @@ namespace winrt::TerminalApp::implementation
             }
         });
 
+        newTabImpl->FindRequested([weakTab, weakThis{ get_weak() }]() {
+            auto page{ weakThis.get() };
+            auto tab{ weakTab.get() };
+
+            if (page && tab)
+            {
+                page->_Find();
+            }
+        });
+
         auto tabViewItem = newTabImpl->TabViewItem();
         _tabView.TabItems().Append(tabViewItem);
 

src/cascadia/TerminalApp/TerminalTab.cpp

@@ -1273,6 +1273,23 @@ namespace winrt::TerminalApp::implementation
             exportTabMenuItem.Icon(exportTabSymbol);
         }
 
+        Controls::MenuFlyoutItem findMenuItem;
+        {
+            // "Split Tab"
+            Controls::FontIcon findSymbol;
+            findSymbol.FontFamily(Media::FontFamily{ L"Segoe Fluent Icons, Segoe MDL2 Assets" });
+            findSymbol.Glyph(L"\xF78B"); // SearchMedium
+
+            findMenuItem.Click([weakThis](auto&&, auto&&) {
+                if (auto tab{ weakThis.get() })
+                {
+                    tab->_FindRequestedHandlers();
+                }
+            });
+            findMenuItem.Text(RS_(L"FindText"));
+            findMenuItem.Icon(findSymbol);
+        }
+
         // Build the menu
         Controls::MenuFlyout contextMenuFlyout;
         Controls::MenuFlyoutSeparator menuSeparator;
@@ -1281,6 +1298,7 @@ namespace winrt::TerminalApp::implementation
         contextMenuFlyout.Items().Append(duplicateTabMenuItem);
         contextMenuFlyout.Items().Append(splitTabMenuItem);
         contextMenuFlyout.Items().Append(exportTabMenuItem);
+        contextMenuFlyout.Items().Append(findMenuItem);
         contextMenuFlyout.Items().Append(menuSeparator);
 
         // GH#5750 - When the context menu is dismissed with ESC, toss the focus
@@ -1291,7 +1309,7 @@ namespace winrt::TerminalApp::implementation
                 // GH#10112 - if we're opening the tab renamer, don't
                 // immediately toss focus to the control. We don't want to steal
                 // focus from the tab renamer.
-                if (!tab->_headerControl.InRename())
+                if (!tab->_headerControl.InRename() && !tab->GetActiveTerminalControl().SearchBoxEditInFocus())
                 {
                     tab->_RequestFocusActiveControlHandlers();
                 }

src/cascadia/TerminalApp/TerminalTab.h

@@ -102,6 +102,7 @@ namespace winrt::TerminalApp::implementation
         WINRT_CALLBACK(TabRaiseVisualBell, winrt::delegate<>);
         WINRT_CALLBACK(DuplicateRequested, winrt::delegate<>);
         WINRT_CALLBACK(SplitTabRequested, winrt::delegate<>);
+        WINRT_CALLBACK(FindRequested, winrt::delegate<>);
         WINRT_CALLBACK(ExportTabRequested, winrt::delegate<>);
         TYPED_EVENT(TaskbarProgressChanged, IInspectable, IInspectable);
 

src/cascadia/TerminalControl/TermControl.cpp

@@ -197,6 +197,20 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         }
     }
 
+    // Method Description:
+    // Find if search box text edit currently is in focus
+    // Return Value:
+    // - true, if search box text edit is in focus
+    bool TermControl::SearchBoxEditInFocus() const
+    {
+        if (!_searchBox)
+        {
+            return false;
+        }
+
+        return _searchBox->TextBox().FocusState() == FocusState::Keyboard;
+    }
+
     // Method Description:
     // - Search text in text buffer. This is triggered if the user click
     //   search button or press enter.

src/cascadia/TerminalControl/TermControl.h

@@ -90,6 +90,8 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         void SearchMatch(const bool goForward);
 
+        bool SearchBoxEditInFocus() const;
+
         bool OnDirectKeyEvent(const uint32_t vkey, const uint8_t scanCode, const bool down);
 
         bool OnMouseWheel(const Windows::Foundation::Point location, const int32_t delta, const bool leftButtonDown, const bool midButtonDown, const bool rightButtonDown);

src/cascadia/TerminalControl/TermControl.idl

@@ -62,6 +62,7 @@ namespace Microsoft.Terminal.Control
         void ScrollViewport(Int32 viewTop);
 
         void CreateSearchBoxControl();
+        Boolean SearchBoxEditInFocus();
 
         void SearchMatch(Boolean goForward);