[Feature]: Add flag to update reference screenshots from latest test results without re-running tests

[mag09]

🚀 Feature Request

Current Behavior

To update reference screenshots after detecting UI changes, we need to:

1. Run tests first time - differences are detected and stored in test-results folder
2. Run tests second time with -u or --update-snapshots flag to update reference images
   This means running the same tests twice, which is time-consuming.

Proposed Solution

Add new flag --update-snapshots-latest-run that would:

1. Take actual screenshots from test-results folder of the latest test run
2. Update reference images using these screenshots
3. Do this without running tests again

Example

bash# First run - detect differences
$ npm test

# Update references using screenshots from test-results folder
$ npm test --update-snapshots-latest-run

Motivation

Benefits

• Eliminates need for second test run
• Saves significant time on reference image updates
• Uses already existing screenshots from test-results folder
• Perfect for updating multiple screenshots after intended UI changes

Technical Details

• The flag would look for latest screenshots in test-results directory
• Only failed screenshot comparisons would be updated
• No test execution required

Would you consider implementing this optimization? It would significantly improve the workflow when updating reference images.