Remote sketchbook widget rendering empty

[AlbyIanna]

Describe the problem

The Remote Sketchbook Widget renders empty in some circumstances. When it happens, the content is shown as soon as you either

• click inside the (empty) widget content, or
• click inside the sketch code, or
• resize the Sketchbook Widget

To reproduce

1. open the IDE
2. enable the Remote Sketchbook, if disabled
3. click the Sketchbook icon in the left sidebar to open the Sketchbook
4. click the Local Sketchbook icon on the top to open the Local Sketchbook
5. click the Sketchbook icon in the left sidebar to close the Sketchbook
6. click again the Sketchbook icon in the left sidebar to open the Sketchbook
7. click the Remote Sketchbook icon on the top to open the Remote Sketchbook

RESULT:
😢 the Remote Sketchbook content is empty

Expected behavior

RESULT:
😄 the Remote Sketchbook content shows the sketchbook tree

Arduino IDE version

2.0.0-rc8

Operating system

macOS

Operating system version

MacOS Monterey 12.3.1

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details