Call log modal doesn't make background content inert while open

[henrycatalinismith]

Steps to reproduce

1. Open an assignment.
2. Click the log button.
3. Press ⌘ + F5 to start VoiceOver.
4. Use ^⌥→ and ^⌥← to try to interact with the background content behind the modal.

Expected outcome

It should be impossible to interact with the background content while the modal's open.

Actual outcome

It's possible to escape the modal and interact with the background content.

Severity

The success criterion covering this issue is WCAG level A – the minimum level. Most organizations aim for a conformance level of AA, which includes all level A criteria. Having background content available while a modal is open can be a a cause for real confusion so the severity of this issue is high.

Recommendation

In order to create the Expected outcome GIF above I just put the inert attribute on the .App-content div. It could be that that's all it takes to fix this one.