Opening the context menu on a block in the flyout causes the flyout to close

[microbit-robert]

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Description

Opening the context menu on a block in the flyout causes the flyout to close. The flyout should remain open in this case.

When the context menu is opened, ephemeral focus is taken, which leads to the focus manager calling onTreeBlur on the focusable tree.

This calls onTreeBlur in workspace_svg.ts.

In the previous version of this code, this function is called with the nextTree being the flyout workspace, this.isFlyout is false and this.targetWorkspace is null.

This function is now called with the nextTree being null, this.isFlyout is true and this.targetWorkspace is the main Blockly workspace. This results in toolbox.clearSelection() being run when it previously didn't.

This change in behaviour may be related to changes made in #9079.

Reproduction steps

Right click on a block in the flyout and observe the flyout closing.

Stack trace

Screenshots

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