Ckeditor5: [Edge] Cursor repeatedly jumps backward when typing while the console is opened

[PaulParker]

🐞 Bug report

Typing in the balloon editor in Edge causes cursor to jump around.

💻 Version of CKEditor

Latest, whatever is on the demo as of 5/22/2018 https://docs.ckeditor.com/ckeditor5/latest/examples/builds/balloon-editor.html

📋 Steps to reproduce

1. Clear out all info from the editor on the balloon editor demo https://docs.ckeditor.com/ckeditor5/latest/examples/builds/balloon-editor.html
2. Type "This is a test"

✅ Expected result
Editor should show "This is a test"

❎ Actual result
Cursor repeatedly jumps backwards / to the left, causing the typed text to be incorrect. Editor ends up showing "This sat iest" because the cursor has jumped backwards twice during typing.

📃 Other details that might be useful
Edge version info:
Microsoft Edge 42.17134.1.0
Microsoft EdgeHTML 17.17134

No errors in the console (error occurs whether or not the dev console is open)

Strangely this doesn't fail on all Edge17/Win10 setups.

[Mgsy]

Hi, @PaulParker, thanks for the report. It looks like a case that we are aware (but I think we don't have a proper ticket) and it's another bug which occurs only when the console is opened.

I've tested it and wasn't able to reproduce this issue. Could you look at it once again and check whether it's reproducible with the console closed?

[PaulParker]

@Mgsy actually you're right, after retesting I cannot reproduce the issue without the console open. That's weird because I was pretty sure I had tried it yesterday with the console closed, but I guess not.

[Mgsy]

I got some good news - this bug isn't reproducible in the latest Edge (17.17134).