message: Trigger taskbar progress evaluation upon pane activation
  Trigger TaskbarProgressChanged every time we switch between active panes
  (to update the tab header if required).
  Closes
diff: @@ -666,6 +666,11 @@ namespace winrt::TerminalApp::implementation
  _RecalculateAndApplyReadOnly();
  + if (const auto control{ pane->GetTerminalControl() })
  + {
  + control.TaskbarProgressChanged();
  + }
  +
  // Raise our own ActivePaneChanged event.
  _ActivePaneChangedHandlers();
  }
  