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21bebb9d29
Introduces ASLayoutRangeModeVisibleOnly, allowing the preservation of decoded backing stores without any extra padding to strictly minimize memory usage while supporting immediate re-display of content. Set visible range controllers to this mode upon app suspend / memory warning, while more aggressively clearing others to the ASLayoutRangeModeLowMemory mode. By default, when the app is running and recieves a memory warning, we set the range mode for non-visible controllers to ASLayoutRangeModeVisibleOnly. This is because, unlike in the app suspend case where on app resume we can restore controllers from LowMemory to VisibleOnly, the memory warning doesn't provide a good opportunity to do this. A new +Beta API to control this behavior is called +setRangeModeForMemoryWarnings:, as some apps may prefer to use LowMemory in the memory warning scenario. For these apps, optimal user experience will require manually setting the range mode back to some larger value as the user navigates the app, or they will encounter controllers that are temporarily blank and need a moment to re-display their contents as they start to become visible.