Description:
When I open the file with a huge number of rows with some groups, I see "-" on the left. The sign is "-" but rows are already hided. When I click on "-" sign,
it changes to "+" but nothing happens more. If I click on "+" again the group items being showed.

Steps to Reproduce:
1.build a spreadsheet
2.group the data for two-three levels and hide all the rows by clicking "-" sign
3.save the file and exit
4.open the file and see "-" sign on the left 

Actual Results:  
it doesn't change my comfort and doesn't data damage
I click twice to correct the sign 

Expected Results:
it should show "+" when the rows are hided, should show "-" when the rows are showed


Reproducible: Always


User Profile Reset: No



Additional Info:


User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36