move mode for stacks of blocks #9625

Check for duplicates

• I have searched for similar issues before opening a new one.

Description

• Shift+M should activate move mode for the focused block and its children (the same set of blocks that would be moved if you use the mouse)
• We should say how many blocks are moving in the aria output, but it would be most useful to only count connected next blocks (i.e. the size of the stack). call these "stack blocks"

Reproduction steps

Priority

No response

Stack trace

Screenshots

No response

Browsers

No response