Can't navigate with keyboard through non-editable cells

[Marc-Andre-Rivet]

Using the standalone app (for simplicity, will be the same with callbacks).
Not sure when this regression appeared, probably <=1.0.0.

Modify eee and fff columns in data.ts with

editable: false

Navigating with the keyboard, upon reaching columns eee or fff, won't be able to move from the cell afterwards.

[Marc-Andre-Rivet]

Reproducing this turned out to be a little more subtle than just making the entire table readonly. The problem arises when the navigation goes through an editable cell.

If all cells are readonly, the initial mouse click will set the focus on some <td> and it will remain there through keyboard navigations.

If rows are not all readonly, keyboard navigation will eventually be on an editable cell and the focus will change to be on an input. When the focus changes to another editable cell there's no problem: the focus is moved to the new input, but if a readonly cell is selected, there is no focused element. Making it impossible to move the selection through the keyboard anymore.