Switching power source retains tab, even if it does not exist

[Marcel Waldvogel]

When switching from a power source (e.g., "Laptop battery") to another power source (e.g. "AC adapter"), where the latter does not have the tab which was selected in the former, then no information at all is displayed.

Ubuntu 21.04, gnome-power-manager 3.32.0-2

Actual behavior
===============

1. `gnome-power-statistics` starts with "AC adapter" selected left and "Details" tab being shown on the right
2. Click on "Laptop battery" left: Laptop battery "Details" tab is shown on the right
3. Click on "History" or "Statistics" tab: The appropriate information for "Laptop battery" is shown on the right. So far, so good.
4. Click on "AC adapter" left again: Now, *nothing* is shown on the right. This should not happen.

Expected behavior
=================
4. Click on "AC adapter": "Details" tab should be shown. (In general: *Any* tab should be shown, but here, "Details" is the only one available.)

This is probably a result from trying to fix https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/766876

[Sebastien Bacher (seb128)]

Sounds similar to the upstream report https://gitlab.gnome.org/GNOME/gnome-power-manager/-/issues/11