After the scanning is complete, the scanning window only disappears after a timeout

[leiouotto]

Describe the bug
After the scanning operation is completed, the image appears on the interface, but the scanning window does not disappear immediately. Instead, it takes some time before the scanning window disappears.

To Reproduce
Steps to reproduce the behavior:

1. Enter the NAPS2 main interface.
2. Place a sample sheet on the printer's flatbed, select the corresponding printer device, and click the Scan button.
3. The image has already appeared on the screen, indicating that the scanning operation is complete, but the scanning window takes some time to disappear.

Expected behavior
During the scanning operation, the scanned image appears on the screen, and the scanning window should disappear immediately, not after a timeout period. Alternatively, the timeout duration should be shortened.

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Version 7.5.1.0 and 7.5.2.0

Additional context
Add any other context about the problem here.