Fix select all menu item behaviour and add icon

app/src/main/java/com/readrops/app/activities/MainActivity.java

@@ -265,8 +265,14 @@ public class MainActivity extends AppCompatActivity implements SwipeRefreshLayou
                                 setReadState(false);
                                 break;
                             case R.id.item_select_all:
+                                if (allItemsSelected) {
+                                    adapter.unselectAll();
+                                    allItemsSelected = false;
+                                    actionMode.finish();
+                                } else {
                                     adapter.selectAll();
                                     allItemsSelected = true;
+                                }
                                 break;
                         }
 

app/src/main/java/com/readrops/app/views/MainItemListAdapter.java

@@ -205,6 +205,11 @@ public class MainItemListAdapter extends PagedListAdapter<ItemWithFeed, MainItem
         notifyDataSetChanged();
     }
 
+    public void unselectAll() {
+        selection.clear();
+        notifyDataSetChanged();
+    }
+
     public List<ItemWithFeed> getSelectedItems() {
         List<ItemWithFeed> items = new ArrayList<>();
 

app/src/main/res/drawable/ic_select_all_white.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M3,5h2L5,3c-1.1,0 -2,0.9 -2,2zM3,13h2v-2L3,11v2zM7,21h2v-2L7,19v2zM3,9h2L5,7L3,7v2zM13,3h-2v2h2L13,3zM19,3v2h2c0,-1.1 -0.9,-2 -2,-2zM5,21v-2L3,19c0,1.1 0.9,2 2,2zM3,17h2v-2L3,15v2zM9,3L7,3v2h2L9,3zM11,21h2v-2h-2v2zM19,13h2v-2h-2v2zM19,21c1.1,0 2,-0.9 2,-2h-2v2zM19,9h2L21,7h-2v2zM19,17h2v-2h-2v2zM15,21h2v-2h-2v2zM15,5h2L17,3h-2v2zM7,17h10L17,7L7,7v10zM9,9h6v6L9,15L9,9z"/>
+</vector>

app/src/main/res/menu/item_list_contextual_menu.xml

@@ -17,6 +17,7 @@
     <item
         android:id="@+id/item_select_all"
         android:title="@string/select_all"
-        app:showAsAction="never" />
+        android:icon="@drawable/ic_select_all_white"
+        app:showAsAction="ifRoom" />
 
 </menu>