Media filter causes "too much recursion" JS error in CKEditor after updating to latest dev

After updating a customer site to latest dev version of Media and CKEditor module 1.16 (patched with https://www.drupal.org/node/2159403#comment-9518083), as well as updating the CKE library itself to version 4.4.6, we are running quite often into "too much recursion" JS errors, when trying to edit existing nodes. Unfortunately we didn't recognize this immediately, as it depends heavily on the content inside the CKEditor enabled textarea. The first time it happened on a quite big Simplenews node, having table layout and lots of images inside. Shortening the content, especially removing some images, helped.

After playing around with CKEditor and text format configuration, I've found out, that unchecking the "Plugin for inserting images from Drupal media module" resolved the problem. However, it's of course important to have the filter enabled.

Today, I've found a very simple content, only having two paragraphs, two h2 elements and an unordered list with three list items, without any inserted media. But nevertheless I also get the same error on that page. Again, when I disable the media filter, I can edit the node without any problem. See the attached sample.txt file for the source code.

I've setup a fresh installation of Drupal, with the same versions of Media, CKEditor (module + library). I can reconstruct the error there also with the simple markup from the attached file!

I'm trying to further investigate this. Currently I'm suspecting, that the following commit could have raised the problem: http://cgit.drupalcode.org/media/commit/modules/media_wysiwyg/js/media_w...

There's another issue, that may sound similar, but as far as I see, it's different to this. However, I will add it as related issue: #1266064: The media filter allows infinite recursion via media_token_to_markup()

Update

Still unsure which change could have caused the problem. Maybe some change withiin the library itself could also have to do with the problem. I can successfully insert the sample markup on another customer site with a slightly older version.

This setup works:

• CKEditor module 1.16 with this patch: https://www.drupal.org/node/2159403#comment-9266737 (older version of the patch of the same thread)
• Media 2.0-alpha4
• CKEditor library 4.4.3 WITHOUT Widget plugin

Again, the setup that doesn't work:

• CKEditor module 1.16 with this patch: https://www.drupal.org/node/2159403#comment-9518083
• Media 2.0-alpha4+24-dev
• CKEditor library 4.4.6 WITH Widget plugin

IMPORTANT UPDATE

I've just tried out CKE 4.4.7 on my test environment: first with and then without Widget plugin. Obviously Media Filter + CKE widget plugin in combination are causing the error.

But what does this mean for us? As it seems, using the widget plugin is the recommended way since #1504696: Integration with CKEditor module. So I'm worried about possible negative consequences of removing the widget plugin. Would be great to have some background on this topic. Anyone who knows more about that???

I will now try on our customer's site CKE without widget plugin. Not sure, if it's 100% necessary, but I will include the patch from #2177893: Custom wrapper breaks tokens with CKEditor >=4.0 without widget plugin