[Feature] Support switching tabpages on `FernDo`

[ydzhou]

Close Fern in previous tab when I open file in the new tab. Currently FernDo based close drawer does not support this.

[Shougo]

Why the feature is needed?

[ydzhou]

We can use FernDo to achieve open then close the drawer, but FernDo does work for open in new tab then close the drawer in previous tab. So I want to have a way of achieving this behavior.

It is useful if someone just want to open one file and then close the drawer to save working space (or minimize distraction from Fern).

[Shougo]

Hm. It seems the feature request for FernDo.