Setting .enabled: false is a worthy suggestion, but I think that would
make the problem slightly worse, not better. Animating from
disabled×unchecked to enabled×checked would be even more noticeable —
and therefore even more distracting — than from enabled×unchecked to
enabled×checked.

Having an “unknown” state would work (the micro equivalent to a
“skeleton screen” for a screen as a whole), but it seems a bit
excessive. It would be a 1/3 increase in visual design work for
checkboxes and radio buttons, and a 50% increase for switches, for
something that is not only seldom seen, but also, when it is seen, is
seen only for a fraction of a second.

So, I still think a better approach would be simply not to show the
control at all until its value is known.

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https://bugs.launchpad.net/bugs/1276066

Title:
  Checkbox needs 'unknown' state

Status in Ubuntu UI Toolkit:
  Incomplete
Status in Ubuntu UX:
  Confirmed
Status in ubuntu-ui-toolkit package in Ubuntu:
  Incomplete

Bug description:
  The Checkbox component always animates its state transitions.
  Sometimes, the "checked" property is set shortly after initialization,
  which shows the animation when creating a page. For example, this
  happens when using the GSettings object, which fills in its properties
  in its componentCompleted:

      GSettings {
          id: settings
          schema.id: "com.ubuntu.touch.system"
      }

      CheckBox {
          checked: settings.autoBrightness
      }

  It would be nice if there was a property "animate" which could be used
  to suppress animations while loading a page.

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