Fix left/right movement of caret while editing with selectRange enabled.

[andy-5]

This is a fix for #4563.

I'm not sure why keyNavigate and keyNavigateRange always called e.preventDefault(), but using just the commented line inside the if block fixes caret movement while editing.

Or is there any reason to call e.preventDefault() even if range-navigation is not allowed?
I think the event handlers should not have any effect in this case, as implemented in this PR.

[azmy60]

Thanks for making the PR! It was commented because the page would scroll if you press arrow keys when you're no longer able to navigate at the side of the table. It was from this PR: #4474

I should've implemented a better solution, so .preventDefault inside the if statement is fine. But we also need to address the issue I mentioned. Probably this.navigate should return true even if the range is not moved.

[andy-5]

I changed it so that this.navigate returns true even if the range is not moved, as you suggested. This seems to work great (tested also with the example linked in #4474).

[azmy60]

Awesome! Thanks!