[Inline] Bad positioning of floating space with page h-scroll

[Olek Nowodziński]

1. Add the following to inlineall sample to have a very narrow toolbar for better experience:

   CKEDITOR.config.toolbarGroups = [
   	{ name: 'links' },
   	{ name: 'insert' },
   	{ name: 'others' },
   ];
   

2. Make the browser window narrow, so h-scroll appears.
3. Focus the middle-column editor.
4. Play with h-scroll to see the toolbar not following the editable.

Cause: page h-scroll is included for non-pinned toolbars, however, if left: auto and right: Npx, it must be negative.

[Olek Nowodziński]

Proposed a fix in ​t/9903 branch.

[Jakub Ś]

There is also v-scroll problem: #9816 and #9899 (possible duplicate.)

[Alexander]

Subscribed

[Matti Järvinen]

Added myself to cc

[Olek Nowodziński]

Fixed issue with ​git:831d932fba25869f1.