Editor erroneously auto back-indents when typing { } inside comment

[peterflynn]

Steps:

1. Paste the following code into an editor:

function foo() {
    /**
     */
    function bar() {
    }
}

(ugh, I don't know why GitHub is formatting this so badly... fix the code to be properly indented before continuing with the next steps)
2. Put the cursor after the **
3. Press enter, tab, type " * "
4. Now type @param {foo}

Result:
When you type the "{" the entire line gets back-indented one tab (back to zero indentation).
If you correct it and then finish typing, it gets back-indented again when you type the "}".

Expected:
No indentation change.

This repros in the vanilla CodeMirror demo too, so marking it as external.

[peterflynn]

Here's what the code above should looks like:

function foo() {
    /**
     */
    function bar() {
    }
}

[peterflynn]

I'm pretty sure I've also hit cases where it overzealously back-indents when typing real code (i.e. not inside a comment), but I don't have solid repro steps yet...

[peterflynn]

A few other odd things to note here:

• It back-indents far more than the Shift+Tab gesture would: it always trims all whitespace to the left of the "*", while Shift+Tab only ever removes one tab's worth of spaces.
• If you go to the start of the line and hit Tab, that also back indents instead of indenting. Only afterward, when there's no whitespace at the start of the line, does Tab forward indent as you'd expect.

[jlondon]

Recommending for Sprint 4 Bug Fix Story

[gruehle]

Marking FBNC and assigning to Peter to close.

[peterflynn]

Nice