message: Timeline UI - dont allow posibility of negative duration (win)
diff: @@ -366,14 +366,14 @@ namespace TogglDesktop.ViewModels
  {
  var (first, last) = GetOverlappingPair(item, blocks);
  if (last == null) return;
  - Toggl.SetTimeEntryEndTimeStamp(first.TimeEntryId, (long)last.Started - 1);
  + Toggl.SetTimeEntryEndTimeStamp(first.TimeEntryId, (long)last.Started);
  }
  public static void ChangeLastEntryStart(TimeEntryBlock item, List<TimeEntryBlock> blocks)
  {
  var (first, last) = GetOverlappingPair(item, blocks);
  if (last == null) return;
  - Toggl.SetTimeEntryStartTimeStamp(last.TimeEntryId, (long)first.Ended + 1);
  + Toggl.SetTimeEntryStartTimeStamp(last.TimeEntryId, (long)first.Ended);
  }
  private static (TimeEntryBlock First, TimeEntryBlock Last) GetOverlappingPair(TimeEntryBlock item, IEnumerable<TimeEntryBlock> blocks)
  