d6197b0904
When reacting to background settings changes, we may end up queuing more than one load. The redundant backgrounds are expected to be destroyed when the previous background has faded out; however since commit 933f38390ba1512aa, the tweened actor is the same for all consecutive load operations and we end up with a single onComplete handler, ergo a single destroyed actor. As new backgrounds are always added to the bottom, we are not only piling up additional background actors, but break changing backgrounds more than once, as the correct background ends up being covered by previously added redundant actors. Fix this by destroying redundant actors right after loading rather than waiting for the fade animation to complete. https://bugzilla.gnome.org/show_bug.cgi?id=726120
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