Release notes for Optimizely updates

When you add an image to the TinyMCE by using the image tool, the description is by default left empty, and thus the "alt" attribute is missing in the HTML.

If you drag and drop the same image in the editor, then the correct value for the "alt" attribute is displayed in the HTML.

Steps to reproduce:

1. Create and publish a configurable view that allows editors to create Editional blocks (that is, blocks having TinyMCE). 
2. Open the view on CM.
3. Add new > Enter required field. 
4. Enter data to Mainbody (TinyMCE property)
5. Click Save.

Actual result:

Error script : widgets.js:2 Uncaught TypeError: Cannot read property 'tagName' of null
at Object.set (widgets.js:2)
at Object._onChange (widgets.js:2)
at Object.<anonymous> (widgets.js:2)
at widgets.js:2

Expected result:

No error script.

Update TinyMCE to 4.9.11

Steps to reproduce:

1. Configure dirtyCheckInterval to 3 seconds. https://bartoszsekula.com/post/2018/09/17/how-to-change-the-delay-between-subsequent-saves-in-episerver-tinymce
2. Edit a page
3. Press enter several times quickly

Expected: To only save once 3 seconds after the last enter press.
Actual: Each enter press will save

Steps to reproduce:

1. Edit and publish a page with TinyMCE property
2. Add version gadget and switch to previous version.
3. Go to All Properties Editing. TinyMCE property should be now readonly

Actual: Editor can't copy text from property
Expected: Should be doable

If you set language to Suomi (Finland), there are incorrect texts at the Taulukko (Table) and (Sarake) Column of TinyMCE.

Selections “Lisää rivi ennen” (Add row before) and “Lisää rivi jälkeen” (Add row after) should be “Lisää sarake ennen” (Add column before) and “Lisää sarake jälkeen” (Add column after).

Enable the anchor button plugin by default.

Steps to reproduce

1. Create a new content item (Page1) with an XhtmlString property.
2. Open the TinyMCE editor on Page1.
3. DnD an image file (Image1.png) from the computer to the TinyMCE editor.
4. Open Page1's "For This Page" media folder.

Expected:
The new image appears in the media folder.

Actual:
The new image does not appear in the media folder.

Note: The only happens if the "For This Page" folder is not created or empty (ID=4). The new image item is listed after reloading the webpage or reopening Page1.

Steps to reproduce:
1. Create a page with a xhtmlstring property, such as product page - Alloy Plan.
2. Drag and drop an image to the xhtmlstring property.
=> The image is uploaded to "For this page" folder.
3. Drag and drop a different image with the same name as the one in step 2.

Expected:
Should show a warning message that you're about to overwrite an image.

Actual:
Image is overwritten without warning.