WYSIWYG deletes typed text due to fake selection

Thanks to Marius Dumitru Florea for an explanation of this issue

This is what happens:

• CKEditor supports a real selection (e.g. the caret used to type text or when you select some text) and a fake selection (e.g. when you select some cells or rows from a table, and you see the blue background)
• the fake selection has priority, meaning that when a fake selection is set, it gets returned even if there is also a real selection
  * the fake selection is normally cleared by various actions performed in the editor (e.g. click, press Enter, etc.)

• after you insert a new table row (below) in your test case, the first row/cell gets selected (and this is a fake selection). You can see the blue background.
• even though you click on the cell below and you start typing (and the blue background disappears), for some reason the fake selection is not cleared
• when you press Delete, it acts on the fake selection instead of the real selection, and thus it deletes the content from the cells included in the fake selection.

The difference between our editor and the CKEditor 4 demo is that the fake selection is cleared when you click on the cell bellow. I tried to understand why but I failed. Note that our editor has a single listener for Delete key but it's not even called (because CKEditor's listener for fake selection cancels the event). So the problem is in the core CKEditor, but it's not easy to debug selection problems because you can't do step by step debugging because the selection changes once the focus is lost..