Onload and on ToggleSequenceNumber, last element is selected on backend, but not UI

[JeffreyGaydos]

Not link dependent

[JeffreyGaydos]

Fixed:

• If text is currently selected, that text will stay selected after load/toggle/collapse unless the collapse causes it to be hidden
• Done via the RefreshMainWindow function, so anything that uses that will also inherit this change
  • This required some extra changes to handle deletions and additions properly