[folding] Newlines created by Insert Line Above command get sucked into previous code fold

Issue Type: <b>Bug</b> I'm using pug, but this happens with other indention based languages like python. Using the following code block, fold the first `ul` and put the cursor in front of the second `ul`. If you press enter a newline is added outside the fold, but if you use the Insert Line Above command(ctrl+shift+enter) the newline gets sucked into the fold. ```Pug ul li ul li ``` VS Code version: Code - Insiders 1.61.0-insider (aec6ee09fa1021cb59c7f4f4d000b027febc967d, 2021-09-03T05:15:18.823Z) OS version: Linux x64 4.15.0-154-generic Restricted Mode: No Extensions: none <!-- generated by issue reporter -->