Given the code in attached Test.xml

1. IDEA will color the click="onClick()" red, correctly, as the method onClick() is missing
2. Type Alt-enter for quick-fix and select "Create Function ..." (or Create Method, doesn't matter)
3. IDEA will suggest this:

private function onClick(): {}

and place the cursor after the "colon"

4. type "void" as return type AND PRESS TAB

And IDEA will delete all code in the rest of the script block.

If instead of pressing TAB, I press Enter", it works.

Issue was resolved