When calling setExpanded(false) on a collapsible toolbox category programmatically, the flyout should be closed

[BeksOmega]

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Description

Originally reported by: https://groups.google.com/g/blockly/c/V5thY4HxQPI/m/bnlVYlzBAgAJ?utm_medium=email&utm_source=footer

If you call setExpanded(false) on a collapsible toolbox category, and one of the sub-categories is currently selected (i.e. its blocks are shown in the flyout). That flyout should be closed.

Reproduction steps

1. Open the playground with the test blocks toolbox.
2. Select the "Connections > Row" toolbox category
3. Run the following code in the console Blockly.getMainWorkspace().getToolbox().getToolboxItems()[2].setExpanded(false);
4. Observe how the category is closed but the flyout is still open.

Stack trace

N/A

Screenshots

Step 2:

Step 4:

Browsers

No response

[itsjayway]

i can take a look at this one! i'll double check the guidelines and message guide for when I open a PR (saw a comment in another PR 🕵️‍♀️)