Can mutate blocks in readOnly workspace

[michaela-mm]

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Description

If there is a block with mutator in a readOnly workspace, I can click on the mutator icon, open the mutator bubble and change the block that way. I think the icon used to just be disabled pre-v10?

Reproduction steps

1. Run npm run start and switch to the Advanced playground link.
2. Drag in an if block
3. Check the readOnly option and reload.
4. You can add else and ifelse rows to the if block.

Stack trace

No response

Screenshots

Browsers

Chrome desktop

To Fix

1. Run the reproduction steps to make sure you can replicate the issue.
2. Modify the onClick method of the MutatorIcon to return early if this.sourceBlock.isEditable() is false.
3. Rerun the reproduction steps and make sure you can't reproduce.

[Apoorvgarg-creator]

@BeksOmega @maribethb Can I take this issue ?

[BeksOmega]

Go for it @Apoorvgarg-creator =)