442466 - locked <preference>s don't disable all their UI

Status: NEW

(Toolkit :: Preferences, defect)

Description

[Karsten Düsterloh]

One can lock preferences by specifying a special lock file which e.g. sets 
  lockPref("pref442251", "fixed value");

These locked prefs will disable all elements referencing them directly via the "preference" attribute, but other elements tied to it (via "control" or "aria-labelledby" attributes) will not.
But should be.

Basically, I think the problem is here in setElementValue <http://bonsai.mozilla.org/cvsblame.cgi?file=/mozilla/toolkit/content/widgets/preferences.xml&rev=1.81&mark=380-381#376>:

          if (this.locked)
            aElement.disabled = true;

Here, the same processing should be done as in the <preference>.disabled setter (once bug 442454 is fixed), disabling all tied elements also.