RTE is collapsed when loaded inside a hidden tab in Safari
The rich text editor is not loaded when it's placed on a hidden tab in Safari on Mac OS X. If the accordant tab gets enabled, RTE won't load correctly (see the attached screenshot). Could not reproduce this behaviour in Firefox.
The RTE is loaded, but the editing area is collapsed (height is zero). Resizing makes it appear.
The problem exists when loading the RTE in a hidden tab in all browsers except Firefox.
(issue imported from #M13956)