[IE8] Many "Invalid argument" errors when beginning of the document is removed

[Piotr Jasiun]

1. Open replacebyclass.html sample in IE 8.
2. Select content: from strike through three and up to the begging of the document.
3. Press Ctrl+C or Delete.

Result: Error: Invalid argument and Browser crash.

The same in inline.

IE9 and Chrome works fine.

Since 4.0.

[Piotr Jasiun]

Screencast attached.

[Piotrek Koszuliński]

We need to investigate this issues.

First of all - using git bisect, because it may give us some idea what change (most likely some completely unrelated one) caused this.

[Piotr Jasiun]

I get a browser crash because of debugging configuration. With the default settings you should get "only" plenty of "Invalid argument." errors.

[Piotrek Koszuliński]

Unfortunately this issue is a very serious IE's bug. I triggered it without any plugins:

var editor = CKEDITOR.inline( 'editable', { plugins: '', allowedContent: true } );

and in both kind of editors. IE starts to throw errors for nearly every DOM operation, so I don't see a place where we could handle it with try-catch.

I even triggered it on native contenteditable with one line of selection#getRanges. See 11427.html​.

However, to trigger this, we need very precise HTML. Even a space after image is important! And there has to be an inline element inside second paragraph. And image has to be floated. Therefore, I don't see this as a bug for which we should waste more time.

[Jakub Ś]

I think I have another TC for this one:

1. Open replacebycode sample
2. Click 3 times on "Apollo 11" header. It should be selected after these 3 clicks.
3. Press Delete key or type any letter

Result: Error is thrown and page crashes.

There are also other similar issues: #10584 and #10477.