This commit fixes the issue of adding single-span items in between full-span items whilst using `StaggeredGridLayoutManager` on recycler view.
Adding such items results in:
```
java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 13
at java.util.Arrays.rangeCheck(Arrays.java:123)
at java.util.Arrays.fill(Arrays.java:2828)
at androidx.recyclerview.widget.StaggeredGridLayoutManager$LazySpanLookup.invalidateAfter(StaggeredGridLayoutManager.java:2876)
at androidx.recyclerview.widget.StaggeredGridLayoutManager.handleUpdate(StaggeredGridLayoutManager.java:1548)
at androidx.recyclerview.widget.StaggeredGridLayoutManager.onItemsUpdated(StaggeredGridLayoutManager.java:1524)
at androidx.recyclerview.widget.RecyclerView$6.dispatchUpdate(RecyclerView.java:1021)
at androidx.recyclerview.widget.RecyclerView$6.onDispatchSecondPass(RecyclerView.java:1032)
at androidx.recyclerview.widget.AdapterHelper.consumePostponedUpdates(AdapterHelper.java:121)
at androidx.recyclerview.widget.AdapterHelper.consumeUpdatesInOnePass(AdapterHelper.java:557)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4128)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
...and more
```
Affects versions including and prior to androidx.recyclerview:recyclerview:1.2.0-alpha02 (at the time of this commit) and possibly more after that.
This bug is caused by a single fact and that is - array inside of `LazySpanLookup` is not being invalidated and resized correctly when non-full-span item is being added in between of two full-span items. The invalidation however passes on some (high performance) devices so it doesn't necessarily cause issues for _some_ users; others keep getting the same crash over and over again.
Possible fix for anyone reading this, in the hope of fixing the same error, is to copy-paste the `StaggeredGridLayoutManager` and fix the array length before calling `Arrays.fill()`. There's no fix from user's perspective if you need to keep the UI as-is.
We however don't need the UI as-is, so we're instead opting to use LinearLayoutManager until is the issue resolved.
Continues tracking at https://issuetracker.google.com/issues/37034096Close#2631
The FlashActivity has been removed and all of it's functionality has been transferred to the FlashFragment.
The FlashFragment needs to be however launched in a different way than the activity using the MainActivity's stub and so seemingly massive changes had to be made.
Notably the RemoteFileService didn't seem to be calling Service.startForeground(), which has been crashing the application due to the system requirements, so that's been fixed.
The updated layout has extended features such as reboot (not implemented yet), more details with not text ellipsis and easy extendability with further parameters, detail or whatever
More improvements to homescreen to come in upcoming commits.
Note, and the backdrop, has been removed, since users which have chosen device that doesn't receive security updates in, at least 2 months, are getting triggered by their own choices (:
