[Bug 1039543] Re: Incorrect behaviour of category checkboxes

[ariel cornejo]

>  It looks like we need an expected behavior description.
Simple: the category checkbox is currently toggling all the children items, when its new state should be propagated to  all children:
* selecting a category results in all children being selected
* de-selecting a category results in all children being de-selected (cleared)

Optionally, a third (gray) state would leave the individual selections
as they were last set manually, but I guess that depends on the widget
used.

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https://bugs.launchpad.net/bugs/1039543

Title:
  Incorrect behaviour of category checkboxes

Status in “update-manager” package in Ubuntu:
  Triaged

Bug description:
  update-manager 1:0.156.14.9, Ubuntu 12.04.1 LTS

  Step 1. Select all items in category of updates (e.g. "security updates") manualy not using category checkbox
  Step 2. Category checkbox expected to be selected after all items of category are selected, but it remains unchecked.
  Step 3. If category checkbox is clicked - selection of all items is inverted.

  <https://wiki.ubuntu.com/SoftwareUpdates#expanded>: "The state of the
  checkbox should reflect and change the state of the update checkboxes
  in that section: ☑ checked if they all are, ☐ unchecked if none of
  them are, and ⊟ indeterminate otherwise."

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