Widget Screen: Dirty state is not reset after saving

[Mamaduka]

Description

When adding a new block, sometimes you have to save changes twice to clear unsaved changes.

Step-by-step reproduction instructions

1. Go to the new widgets screen.
2. Add a new block to a widget area.
3. Save changes.
4. See snackbar appear.
5. "Update" button isn't disabled.

Expected behaviour

The "Update" button should be disabled after saving changes the first time.

Actual behaviour

Have to save changes twice to see a visual indication that they are saved.

Screenshots or screen recording (optional)

widget-screen-save-twice.mp4

WordPress information

• WordPress version: 5.7.2
• Gutenberg version: 10.7/trunk
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes

[noisysocks]

Confirmed.

[Mamaduka]

I will try to look into this issue later this week.

[noisysocks]

Related to this is that you see a "Are you sure?" prompt when you navigate away from the widgets screen after saving.