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Putting a reporter block in another block then reloading workspace causes crash

See original GitHub issue

Expected Behavior

It should be safe to make copies of my mathematicses.

Actual Behavior

If you nest a reporter inside of another reporter (e.g. using operator blocks), then duplicate it, and switch to the costumes tab and back, it crashes with Shadow block cannot be a top-level block.

Steps to Reproduce

Drag out a + block and nest another + block inside it
Duplicate it
Switch to costumes tab and back

shadow-dupl-bug

Issue Analytics

State:
Created 5 years ago
Comments:6 (5 by maintainers)

Top GitHub Comments

1reaction

AmazingMech2418commented, Aug 18, 2018

https://github.com/LLK/scratch-blocks/blob/698af3fcbb5e18a0e32cc2ead7713b77e20c809b/core/xml.js#L467

0reactions

kchadhacommented, Aug 22, 2018

@rachel-fenichel, you’re right. The VM is definitely doing something weird with shadow blocks. The XML that’s being emitted for a move (x position) steps stack has two shadow blocks, one in the right place (consistent with the XML for the same stack in the vertical playground) and one shadow block at the same level as the move steps block… I will file a separate issue for this…

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