minSpareCols with undo adds too many columns

[AMBudnik]

If we add minSpareCols to the equation it is easier to get the columns back but we get too many columns.

Updated demo https://jsfiddle.net/handsoncode/5cwb9agr/

Steps to reproduce

1. Select A and B column by dragging
2. Use the context menu to delete columns
3. Undo

Result
We get 4 columns instead of 3. With 2 spare columns, there are 6 columns after undo and so on.

Your environment

• Handsontable version: 7.2.1
• Browser Name and version: Chrome 77
• Operating System: Windows 10

Moved from https://github.com/handsontable/dev-handsontable/issues/106

[AMBudnik]

Using pre 8.0.0-beta2 on Windows 10 / Chrome 83

Main case - solved

Demo https://jsfiddle.net/Lswxrvdq/
Result

Case 2 - still replicable

Demo https://jsfiddle.net/fydxcvhL/

Case 3 - still replicable

Demo https://jsfiddle.net/cLt9wk80/

[AMBudnik]

I moved cases 2 and 3 to a separate issue https://github.com/handsontable/dev-handsontable/issues/381

[aninde]

Main case is still fixed with pre-8.0.0-rev1 https://jsfiddle.net/aninde/f9op4c7z/.

[AMBudnik]

Updated demo v 8.0.0 https://jsfiddle.net/5qsyr6ae/ Issue solved (along with the missing border visible on the demo above)