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[v13.0.0-beta.2] Block move causes container to shift on canvas #9815

@microbit-robert

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@microbit-robert

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Description

One can make 'move mode' followed by 'cancel' or 'confirm' shift its parent container across the workspace like a caterpillar. Please see the repro steps below and screen grab.

The type of renderer plays no part and can be reproduce with either.

Maybe related to #9708, but this is unknown.

Reproduction steps

  1. Have a container block
  2. Add at least three statement blocks
  3. Press 'M' on the bottom 2 statement blocks - it doesn't result in any shift of the parent container on the workspace
  4. Press 'M' on the statement block third from the bottom, or any above this - the parent container on the workspace shifts
  5. Repeat for the caterpillar movement effect

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Screen.Recording.2026-05-05.at.15.34.58.mov

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