Fix FFM to apply only if tab is focused (#9198)

In the FFM mode, hovering on the pane might dismiss renamer.
To address this we want to make sure that FFM is applied
only if the Terminal Tab is focused.

src/cascadia/TerminalApp/TerminalTab.cpp

@@ -609,6 +609,19 @@ namespace winrt::TerminalApp::implementation
                 tab->_RecalculateAndApplyReadOnly();
             }
         });
+
+        control.FocusFollowMouseRequested([weakThis](auto&& sender, auto&&) {
+            if (const auto tab{ weakThis.get() })
+            {
+                if (tab->_focusState != FocusState::Unfocused)
+                {
+                    if (const auto termControl{ sender.try_as<winrt::Microsoft::Terminal::TerminalControl::TermControl>() })
+                    {
+                        termControl.Focus(FocusState::Pointer);
+                    }
+                }
+            }
+        });
     }
 
     // Method Description:

src/cascadia/TerminalControl/TermControl.cpp

@@ -1376,7 +1376,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
 
         if (!_focused && _settings.FocusFollowMouse())
         {
-            Focus(FocusState::Pointer);
+            _FocusFollowMouseRequestedHandlers(*this, nullptr);
         }
 
         if (ptr.PointerDeviceType() == Windows::Devices::Input::PointerDeviceType::Mouse || ptr.PointerDeviceType() == Windows::Devices::Input::PointerDeviceType::Pen)

src/cascadia/TerminalControl/TermControl.h

@@ -186,6 +186,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
         TYPED_EVENT(HidePointerCursor, IInspectable, IInspectable);
         TYPED_EVENT(RestorePointerCursor, IInspectable, IInspectable);
         TYPED_EVENT(ReadOnlyChanged, IInspectable, IInspectable);
+        TYPED_EVENT(FocusFollowMouseRequested, IInspectable, IInspectable);
         // clang-format on
 
     private:

src/cascadia/TerminalControl/TermControl.idl

@@ -120,5 +120,6 @@ namespace Microsoft.Terminal.TerminalControl
         Boolean ReadOnly { get; };
         void ToggleReadOnly();
         event Windows.Foundation.TypedEventHandler<Object, Object> ReadOnlyChanged;
+        event Windows.Foundation.TypedEventHandler<Object, Object> FocusFollowMouseRequested;
     }
 }