Skip disconnect of custom panels and iframe panels

[balloob]

Breaking change

Proposed change

Skip the disconnect of panels that leverage iframes when idle.

Avoid disconnecting:

• iFrame panel
• custom panel that is rendered in an iFrame

This will avoid disconnecting ingress panels too, as they are custom panels embedded in an iframe.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[ludeeus]

The section in the releasenotes should probably be adjusted for this https://rc.home-assistant.io/blog/2020/06/24/release-112/#automatically-disconnect-if-a-tab-has-been-hidden-for-5-minutes

So it states that it does not apply to iframes, or custom_panels that embeds as an iframe.

[balloob]

Good idea, will open a PR.

[balloob]

Oh actually, that is about disconnecting the Websocket connection. Not disconnecting the panel from the DOM.