Embeds: Detect focus on embed sandbox #4011
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This pull request seeks to improve the behavior of focusing embed blocks, allowing block selection by clicking on the embed.
Implementation notes:
Detecting click events on iframe is not normally possible, but this uses a technique to detect blur from the host window and whether at the point of blur the active element is the iframe, inferring that this implies that the iframe has received focus.
Testing instructions:
Verify that clicking an embed block selects it.