[FF][IE11] Opening preview using keyboard triggers popup blocker

[Marek Lewandowski]

since: 4.0 (didn't check earlier) until master

1. open any sample with CKEditor (i.e. samples/replacebyclass.html)
2. focus editor
3. press alt+f10 to focus toolbar
4. navigate to preview button
5. press button using space

Expected result:
Preview should appear

Current result:
firefofx: Preview is blocked by popup block
ie11: Exception is being thrown SCRIPT5007: Unable to set property 'location' of undefined or null reference, and popup blocker appears. Error is reported in #11597.

additional info:

1. preview is not blocked when we do this using mouse
2. tested with FF 26.0 at Win7, IE11 at Win8.1

edit: it appears that popup blocker also triggers in IE10 (@Win8), IE9 (@Win7)

[Piotr Jasiun]

Works for me. In fact I get the message that FF block pop-up, at the first time I clicked on preview button, but then everything works fine. Tested on Windows 7 & FF 26.0.

[Jakub Ś]

There are two issues here:

• Firefox and IE8-10 use popup blocker and ask user if he wants to open window (default browser setting). This one can be reproduced from CKEditor 3.0. This may be a "won't fix" issue.
• IE11 displays popup blocker but it also throws error. This problem is reproducible from CKEditor 4.3.2 what makes this ticket a recent regression.

[Piotrek Koszuliński]

Oups. The milestone was only for the recent regression - error on IE11. Popup blocker is totally out of our control considering how complex is the whole process.

[Piotrek Koszuliński]

I reported #11597 for the error part.

[Marek Lewandowski]

Seems that IE10 and IE9 also have this issue.