Found it, it should be only in trunk, released with 5.3.0 [1]. So it is fix released for quantal. I'm still not sure how did you see the fix in 5.2, but I guess that doesn't really matter, as it's fixed anyway.
[1] http://bazaar.launchpad.net/~software-store-developers/software-center/trunk/view/head:/debian/changelog#L31 --- Ubuntu Bug Squad volunteer triager http://wiki.ubuntu.com/BugSquad ** Changed in: software-center (Ubuntu) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to software-center in Ubuntu. https://bugs.launchpad.net/bugs/796525 Title: Checking/unchecking any add-on checkbox moves them all Status in “software-center” package in Ubuntu: Fix Released Bug description: Binary package hint: software-center Ubuntu Software Center 4.0.3, Ubuntu 11.04 Ubuntu Software Center 5.1.14.1, Ubuntu Precise Beta 2 1. Navigate to any item that has add-ons, e.g. Inkscape. 2. Check or uncheck any of the add-ons. 3. Uncheck or check it to return it to its previous state. What happens: 2. The checkbox, and all the other add-on checkboxes, jump downwards. 3. All the add-on checkboxes jump upwards again. What should happen: All the checkboxes stay in the same place. This is because the "Apply Changes" bar appears above the checkboxes. So that bar needs to do one of these: - always be present - have space reserved for it, even when it isn't present - appear only below the list of add-ons, not above - make the page expand upwards when it appears, not downwards, with the checkboxes staying in their current position. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/796525/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp