Peak focus inconsistent with scale

[pomoke]

Is your feature request related to a problem? Please describe. Focus peaking shows different with different scaling. Most pictures exhibit different marked pattern in different scales, which does not help checking focus.

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Describe the solution you'd like Probably calculate gradient of full resolution image, then scale heatmap.

[github-actions[bot]]

This issue has been marked as stale due to inactivity for the last 60 days. It will be automatically closed in 300 days if no update occurs. Please check if the master branch has fixed it and report again or close the issue.