This feature has been removed or disabled as of Android 11 DP4 and Beta 1, and ongoing and persistent notifications can no longer be dismissed/minimized by swiping them away. Our original coverage of the change is below.
While the Note 5 and S6 edge+ are far from the first Samsung phones with reported issues killing background tasks with unusual aggressiveness, they are the first ones with four freaking gigabytes of RAM to do so. We've long assumed that Samsung's background task issues on certain handsets are related to a lack of RAM headroom due to TouchWiz, and yet, the Note 5 and S6 edge+ may exhibit the most aggravating task killing of any Samsung devices we've yet seen. Let's cut to the video for a complete explanation. (I realize it's long, but I'd recommend watching all the way through to see what's going on here.)
One of the fundamental differences between Android and every other mobile operating system is the practically unrestricted capability to run services. Without this freedom we could not enjoy something as powerful as a homescreen widget or as straight-forward as a Twitter client with background updates. Aside from games and very simple utilities, it’s becoming increasingly rare to find an app that doesn’t run a service, at least for a short span of time. However, a bug has snuck into recent versions of Android and it can cripple background processing in some apps and widgets.
Note: There are some technical details ahead, some of which may only matter to developers.
Flash may have died a slow and agonizing death on Android, but it did not depart without leaving its heir apparent. Adobe's lighter-weight successor was built to better handle touchscreen interfaces, lower power processors, and to support applications living independently from a web browser. While the platform hasn't been a high-flying success on Android or iOS, it does play host to a few popular games like Machinarium. Exactly three years and one day after first appearing on the Android Market, Air has been updated to v3.9 and now includes support for multi-threading, background tasks, and xxhdpi icons.
The list of new features for version 3.9 is relatively short, even more so after filtering out the items specific to Mac and iOS.