Inserting non-editable element inside a table cell breaks the table badly

[Piotrek Koszuliński]

1. Open replacebycode sample.
2. Place caret at the beginning or end of some table cell.
3. Insert pagebreak.

Table is totally split. Reproduced on IE11 and Chrome.

Second TC:

1. Open image2 sample.
2. Insert table.
3. Try to insert captioned image inside table cell (note: caret must be at the end or beginning of td).

The same - table is destroyed.

[Jakub Ś]

I was able to reproduce this problem in every browser from CKEditor 4.3.

The easiest scenario is to create new table in empty content are, putting focus into first table cell (if it isn't already there)and inserting page break or widget.

[Piotrek Koszuliński]

Interesting TC it was. I started in editable#insertElement, wrote tests, found range#fixBlock, wrote a lot of tests (was 0), found range#enlarge, wrote test. 1LOC change fixed it.

Code in ​branch:t/11798 on dev and tests.

[Marek Lewandowski]

I've force pushed branches rebased on master. Everything works good.

[Piotrek Koszuliński]

Fixed on master with ​git:8c6d5e4 on dev and 609e037 on tests.