Markdown: `setContent` issues when content only contains whitespace and slashes

[slmnsh]

Affected Packages

markdown

Version(s)

3.25.0

Bug Description

If you try to parse / with contentType: markdown it throws following error:

RangeError: Invalid content for node doc: <>
    at _NodeType.checkContent (chunk-X36TMPZB.js?v=9ef6b9c8:2197:13)
    at _Node.check (chunk-X36TMPZB.js?v=9ef6b9c8:1504:15)
    at chunk-ZQYF7ISI.js?v=9ef6b9c8:1425:12
    at Array.forEach (<anonymous>)
    at chunk-ZQYF7ISI.js?v=9ef6b9c8:1424:11
    at Object.insertContentAt (chunk-ZQYF7ISI.js?v=9ef6b9c8:820:57)
    at chunk-ZQYF7ISI.js?v=9ef6b9c8:1754:19
    at Object.chainedCommand [as setContent] (chunk-ZQYF7ISI.js?v=9ef6b9c8:777:47)
    at input.tsx:123:12

Also if you try to parse \ it just returns empty string for some reason.

Browser Used

Chrome

Code Example URL

No response

Expected Behavior

It should parse it as text node

Additional Context (Optional)

No response

Dependency Updates

• Yes, I've updated all my dependencies.

[codewithsupra]

Would love to be assigned this — I've already put together a fix in #8017 (reproduced the bug, added regression tests, full suite green). Happy to adjust the approach if you'd prefer something different.