Graph Footer: Cache State History

[zsarnett]

Proposed change

Cache the state history of the entity and only fetch from the last update until the time of the new update.

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

[bramkragten]

This

43dc43d#diff-4617a1a8ea3c2e00061a4a28c739de4fR98

Should be inside the check on line 95

[zsarnett]

I will resolve these today. and merge

[zsarnett]

This

43dc43d#diff-4617a1a8ea3c2e00061a4a28c739de4fR98

Should be inside the check on line 95

@bramkragten I am not 100% what you mean by this. Guessing you are talking about the this._fetching but not sure

[bramkragten]

This
43dc43d#diff-4617a1a8ea3c2e00061a4a28c739de4fR98
Should be inside the check on line 95

@bramkragten I am not 100% what you mean by this. Guessing you are talking about the this._fetching but not sure

Line 98 should be in the if check after line 95

EDIT:
Never mind, my eyes are crap.