Operations on checked items does not take database modifications into account

[daniele-athome]

This is because the SparseArray could be outdated if the dialog button is clicked after a modification (e.g. a new thread is created). The stacktrace below doesn't exactly reflect that (because the database is empty, but who knows), anyway the problem is there and should be fixed: take all message or thread ids and store them in a data structure to be used in the dialog callback.

java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
       at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
       at java.util.ArrayList.get(ArrayList.java:308)
       at android.widget.HeaderViewListAdapter.getItem(HeaderViewListAdapter.java:185)
       at android.widget.AdapterView.getItemAtPosition(AdapterView.java:764)
       at org.kontalk.ui.AbstractComposeFragment$3.onClick(AbstractComposeFragment.java:565)
       at com.afollestad.materialdialogs.MaterialDialog.onClick(MaterialDialog.java:367)
       at android.view.View.performClick(View.java:4438)
       at android.view.View$PerformClick.run(View.java:18440)
       at android.os.Handler.handleCallback(Handler.java:733)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5034)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
       at dalvik.system.NativeStart.main(NativeStart.java)

• delete threads
• delete messages