Toolbar won't disappear in action mode

Question

I am trying to implement the feature that, when I am long clicking a list item, the action mode shall start and it shall be possible to delete one or more items.
I am starting in DocumentsActivity a search, which starts a Fragment DocumentsFragment with a ListView and their items. The ListAdapter is initialized and set via method call setListAdapter(this.documentsAdapter) in onCreate of Fragment. I set various listeners on the listview in the onActivityCreated in the Fragment:

public void onActivityCreated(Bundle savedInstanceState) {

    getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
    getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            getListView().setItemChecked(position, true);
            return true; 
    }});
    getListView().setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            menu.clear();
            ((DocumentsActivity)getActivity()).getMenuInflater().inflate(R.menu.documents_context_menu, menu);
            return true;
        }
    });
    super.onActivityCreated(savedInstanceState);
}

When long clicking on a listitem the action mode gets started and the menu documents_context_menu appears to be the action bar. But the problem is, the action bar appears above the toolbar and the toolbar won't disappear (see the picture).

I've tried to call getSupportActionBar().hide() or set it to null or even use another style/theme. It all didn't work. Sometimes the blue toolbar was completely white, but that is all.

I have absolutely no idea why the toolbar won't disappear. May you give some advice?

Thanks in advance!

_____ Update 1 _____

This is the styles.xml

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:fitsSystemWindows">true</item>
    <item name="colorAccent">@color/darkblue100</item>
    <item name="android:actionOverflowButtonStyle">@style/ActionButtonOverflow</item>
    <item name="actionOverflowButtonStyle">@style/ActionButtonOverflow</item>
    <item name="android:actionMenuTextColor">@color/black</item>
</style>

And this is how the action bar is set in the Activity:

protected void onCreate(Bundle savedInstanceState) {
    handleIntent(getIntent());
    requestWindowFeature(5);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_documents);
    Toolbar mToolbar = (Toolbar) findViewById(R.id.tool_bar);
    setSupportActionBar(mToolbar);
    args = getIntent().getExtras();
    if (findViewById(R.id.container_documents) != null && savedInstanceState == null) {
        showDocumentsFragment();
    }
}

Answer 1

As pointed out in the link provided in comments you just need to add following line to your AppTheme style:

<item name="windowActionModeOverlay">true</item>

It just indicates that action mode should overlay window content instead of pushing it down,it tells that you don't need any reserved space for action mode.