To comply with GDPR it would be helpful to blot out sensitive data.

Proposal

• A SensitiveFeedback widget. Wrapping a widget with it will mean that it will be a back box in the screenshot.
• Some sort of SensitiveFeedbackProvider containing a isTakingScreenshot variable that the SensitiveFeedback widget can observe.
• Toggle the isTakingScreenshot variable in ScreenshotController.capture.

I would be happy to implement this myself. But maybe someone has a better proposal before I open a PR.