+1
Vintage: Autocomplete should terminate upon leaving insert mode
See title. When you're entering text it makes sense, but the dropdown should disappear once you exit insert mode (whether into visual or normal mode). One expects j and k to move the cursor, but they navigate through the options instead.
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I second that, it's very frustrating.
At least make it so alternative escape key sequences also close the autocomplete popup (esc key closes it, but my ctrl+[ does not)