Dragged block doesn't get focus first

[clementcontet]

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Description

When we drag a block, it doesn't get the browser focus first, and thus can be in background, hidden by other blocks.

Reproduction steps

1. Get a workspace with two blocks
2. Select (click on) first block so that it gets focus and send the second one to background
3. Drag the second block (without selecting it first) and move it near the first block
4. The second block, while dragged, is displayed behind the first one

Stack trace

No response

Screenshots

Tested right now on https://developers.google.com/blockly:
https://github.com/google/blockly/assets/7261426/7242614b-1115-4736-9437-34400f167599

Browsers

Chrome desktop

[BeksOmega]

I think we forgot to reroll #6874

[BeksOmega]

Fixed by #6874