Completely surround pane with border to make it easy to see active pane

[nscheer]

Hi,

I'm often using Windows Terminal with two adjacent panes.

Here, the left pane is active:

and here the right pane:

Since the border of the active pane is not visible on the outside edges of the window, it is very difficult to see which of these panes is active.

I'd rather have that blue border surround the whole pane.

Using more panes, it gets easier for the inner panes, because more of the border is visible, e.g.

I guess this is not a bug - so I'd rather kindly request this as a feature :)

I'm using Windows Terminal version: 1.17.11461.0 on Windows 11 Pro 22H2

Greetings

Nico

[zadjii-msft]

/dup https://github.com/microsoft/terminal/issues/12186