Set Tab tooltip explicitly

src/cascadia/TerminalApp/TerminalTab.cpp

@@ -45,7 +45,6 @@ namespace winrt::TerminalApp::implementation
                 tab->SetTabText(title);
             }
         });
-
         // Use our header control as the TabViewItem's header
         TabViewItem().Header(_headerControl);
     }
@@ -71,6 +70,13 @@ namespace winrt::TerminalApp::implementation
         _RecalculateAndApplyTabColor();
     }
 
+    void TerminalTab::_SetToolTip(const winrt::hstring& tabTitle)
+    {
+        WUX::Controls::ToolTip toolTip{};
+        toolTip.Content(winrt::box_value(tabTitle));
+        WUX::Controls::ToolTipService::SetToolTip(TabViewItem(), toolTip);
+    }
+
     // Method Description:
     // - Returns nullptr if no children of this tab were the last control to be
     //   focused, or the TermControl that _was_ the last control to be focused (if
@@ -231,6 +237,7 @@ namespace winrt::TerminalApp::implementation
 
             // Update the control to reflect the changed title
             _headerControl.Title(activeTitle);
+            _SetToolTip(activeTitle);
         }
     }
 

src/cascadia/TerminalApp/TerminalTab.h

@@ -93,6 +93,8 @@ namespace winrt::TerminalApp::implementation
 
         void _MakeTabViewItem();
 
+        void _SetToolTip(const winrt::hstring& tabTitle);
+
         void _CreateContextMenu() override;
 
         void _RefreshVisualState();