shrinking size of window can cause sources in the source list to disappear

[redshiftzero]

Description

When you decrease the size of the window, sources can disappear. I've observed this for two sources in the dev env, I decreased the size of the window at only the top (active) source stayed there, the second source disappeared.

Steps to Reproduce

1. Log into client
2. Reduce size of window

Expected behavior

All sources continue to appear in the source list

Actual behavior

One source disappears from the source list

[deeplow]

I think I've seen this one before. Just want to make sure this is the one.

I'm using i3 and when I maximise the window the following happens sometimes

The source is still on the list and can be selected but the text is not visible

After a while it fixed itself (probably an automatic refresh)

[sssoleileraaa]

This bug was reintroduced after #330 was merged. Instead of using the default Qubes selection styling, we want to use our own, but there's this show-decoration-selected:0 bug reported here: #331 (comment)

[sssoleileraaa]

More specifically:

If you remove this line of code the issue is fixed:

https://github.com/freedomofpress/securedrop-client/blob/master/securedrop_client/gui/widgets.py#L840

But we need a better fix/ workaround that doesn't force us to use Qubes selection decoration style.

[sssoleileraaa]

closing because this is a duplicate of: #331
(I'll update its title to be more clear)