Escape hatch completions like '(switch to list)' and '(switch to mapping)'
were being filtered out in VS Code because filterText was set to the key
name (e.g., 'runs-on'), which doesn't match the empty string at the cursor
position when completing a value.
Since escape hatches only appear when the value is empty anyway, there's no
need for filterText. Without it, VS Code uses the label for filtering,
which properly shows them when no text is typed.
eric sciple
c6d2036302