[TYPO3-core] RFC #12506: Bug: JSMENU does not respect mount point overlays

[Joerg Wagner [DigiLog]]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=12506

Branches:
TYPO3_4-2 & trunk
TYPO3_4-3 & trunk

Problem:
JSMENU calculates wrong links for its menu items if the link is an 
overlay mount point. So if the checkbox "Substitute Mount Point (this 
page) with Mounted page" is checked in the page properties of a mount 
point page, JSMENU creates a wrong link for this page (the "&MP=" 
variable in the query string is completely missing).

Solution:
The algorithm for JSMENU link generation in 
/typo3/sysext/cms/tslib/class.tslib_menu.php only accounts for normal 
mount points (adding mounted children to a page) but completely ignores 
the possibility of overlay mount points. The attached patch (for 4.2.10 
and 4.3.0beta2) adds the needed code for MP overlays. It is thoroughly 
tested in a bunch of JSMENU configurations and a life system.

Cheers, Jörg.
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