CheckDirty is true after focusing a widget image2 widget

[Quurks]

Steps to reproduce

Same as #11753, except with Firefox 43.0.1: As soon as you focus a place in a widget where you can put text, CheckDirty is true. (Also works with editor1)

Expected result

CheckDirty remains false

Actual result

CheckDirty switches to true

Other details (browser, OS, CKEditor version, installed plugins)

Firefox 43.0.1 Chrome seems to be ok.

Please also see #12891 for other widgets and checkDirty problems.

[Jakub Ś]

I could not reproduce this problem. Could tell me which widget you have checked?

You ticket is similar to #12891 but this doesn't involve clicking and doesn't happen only in Chrome.

[Quurks]

While testing you have to use a widget in the editor you are testing, if you follow the steps in #11753 exactly, you have to click at the "Apollo CMS-LM spacecraft" text.

[Jakub Ś]

Confirmed. Sorry, I didn't check the issue properly the first time.

Problem with image2 can be reproduced in all browsers in fact. Just run below code in Browser's console, click into image2 editing area and wait

setTimeout(function(){console.log(CKEDITOR.instances.editor1.checkDirty());}, 5000);

I was able to reproduce this issue from CKEditor 4.3.