[v13.0.0-beta.4] Initial placement of top-level blocks inserted by keyboard

[microbit-matt-hillsdon]

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Description

The keyboard nav plugin has reasonable initial placement of top-level blocks inserted via keyboard, e.g.

The Blockly core implementation just makes a pile in the top left, perfectly and confusingly overlapped.

Interestingly, if I also add the other type of function available in the playground I get a separate pile below:

There are many of each block above.

This is a big step back for clients like MakeCode where the program is structured via top-level event handlers.

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