[TYPO3-core] RFC: #16133: Feature: introduce new config setting to completely disable the preview info box

[Andreas Kiessling]

Hi,

this is an SVN patch request.

Type: Feature

BT reference: http://bugs.typo3.org/view.php?id=16133

Branches: trunk

When you view a page in a workspace, you get that little red box in the 
upper right corner, which tells you, that you now see a preview of a 
workspace. While you can already customize the box (layout and text), 
you can not completely disable it. This does not hurt for regular pages, 
but it can really cause headaches,
- when you create an xml based output (you then need to make the box to 
be a xml comment)
- or you create a json object, because you need full TSFE for an ajax 
request (json does not really accept any comments, so this request will 
always fail when there is something after the '}]')

Solution: add a new config option to disable the preview info

TS example:

ajaxPage = PAGE
ajaxPage.typeNum = 57
ajaxPage.config {
     disableAllHeaderCode = 1
     disablePreviewInfo = 1
     additionalHeaders = Content-type:text/x-json
     no_cache = 1
     xhtml_cleaning = 0
     admPanel = 0
}

Note: i also thought about coupling that to the disableAllHeaderCode 
setting, since you will very often set these two options together. But 
with disableAllHeaderCode you can also create your very own html output, 
so i introduced the new setting.

Regards,
Andreas
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