Column Hiding is broken in v7.0 RC10

Describe the bug Hiding columns stopped working in RC10. What still works is adding hiddenColumns in initialState, which results in both the corresponding checkbox being unchecked and table column being hidden.

To Reproduce Steps to reproduce the behavior:

1. Open the default column hiding example linked below.
2. Click “Toggle All” without previous selection, note that it crashes with the error: Uncaught TypeError: Cannot read property 'flatColumns' of undefined.
3. Reload, this time click one of the column checkboxes first. the displayed hiddenColumns array will contain the selected entry, but the checkbox stays checked. The “Toggle All” checkbox enters an indeterminate state. Also, the actual table column is still visible.
4. Click the same column again, instead of toggling the existing entry the same value will be applied to the array again.
5. Click “Toggle All” with some previous selection, see how the hiddenColumns is cleared without an error thrown. The visible table state does not change.

Expected behavior

• Clicking “Toggle All” with no selection should not result in an error.
• Toggling a checkbox should change its checked state.
• Toggling a checkbox should not result in the value being appended to the array multiple times.
• An entry in the hiddenColumns array in state should result in the table columns actually reflecting these values.

Codesandbox The existing column hiding example stopped working: https://codesandbox.io/s/github/tannerlinsley/react-table/tree/master/examples/column-hiding

[tannerlinsley]

Thanks. I’ll have a fix out asap.

[tannerlinsley]

Fix is out in RC.13!