Selected rows doesn't update when a hidden column is shown

[orebete]

It happens when you select some rows.
Then if you change the columns' visibility and a hidden column is changed to visible, it won't mark as selected the new cells.

[6pac]

I have fixed the setColumns method in the grid so that it refreshes the selection. This will be in the next release.
In the meantime, you can refresh the selection after the call to setColumns (assuming you are using RowSelectionModel):

  grid.setColumns(showColArr);
  grid.getSelectionModel().setSelectedRows(getSelectedRows());