Gutenberg: Widget screen: Blue hover line in Widget area moves to the right when block content is present.

[paaljoachim]

Describe the bug
With new block content added to the widget area the blue hover line is pushed to the right.

To reproduce
Steps to reproduce the behavior:

1. Add new block content to the first widget area.
2. Open the Inserter Panel.
3. Hover over a block.
4. Notice how far to the right the blue line is seen.

Expected behavior
I see this when no new block is added:

But adding a new block I see this:

Editor version (please complete the following information):

• WordPress version: 5.5.1
• Does the website has Gutenberg plugin version: 9.1.0
• Theme Twenty Twenty.

Desktop (please complete the following information):
Mac
Chrome
Desktop Server local site

[noisysocks]

I was able to reproduce this.

[kevin940726]

Might be fixed by #25849.

[kevin940726]

Fixed by #25849, feel free to reopen if it didn't.