Group of 2 You'll notice Notable
Slash-command-style autocomplete suggestions can now trigger and be accepted partway through a command you're already typing
What
The command input's autocomplete now supports a new "mid-command" suggestion type. Previously, autocomplete suggestions only appeared when you were at the very start of typing a command; now they can also appear and be completed partway through a command line you've already started typing.
Pressing Tab now checks for a mid-command completion first, before falling back to its other existing behavior.
Why
This lets you get autocomplete help while editing or extending a command you've already begun, instead of only when starting fresh.