Expression auto-completion doesn't work in if multi-line expressions

[elbrenn]

Describe the bug Expression auto-completion doesn't work in if multi-line expressions

Happens only for if where we accept expressions without expression markers.

To Reproduce Steps to reproduce the behavior: See screenshot below no complete suggestions

Expected behavior A clear and concise description of what you expected to happen.

Screenshots Extension Version 0.25.3

Additional context Add any other context about the problem here.

[elbrenn]

"This happens because of the transformation code that we run before auto-completion. At that point we don't know if we're in a multi-line string and therefore add : to the end of the line. That interferes with the expression auto-completion code since suddenly it'll see a stray : at the end of the line."