The online ESC editor seems to have stopped accepting VSCode-like shortcuts. E.g. highlighting a word and pressing " doesn't surround the word in quotes, it now replaces the highlighted word with a single quote ("). Also CTRL+/ doesn't comment lines anymore. Is this expected?

Hmm interesting. We shipped some changes to enable auto-complete (

ctrl+space

to check out the changes). This may have unintentionally regressed some of the behavior you're mentioning. I've opened this issue https://github.com/pulumi/esc/issues/227