Persist search query

app/src/main/java/androidx/appcompat/widget/PersistentSearchView.java

@@ -0,0 +1,33 @@
+package androidx.appcompat.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+public class PersistentSearchView extends SearchView {
+
+    public CharSequence lastQuery;
+
+    public PersistentSearchView(Context context) {
+        super(context);
+    }
+
+    public PersistentSearchView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public PersistentSearchView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    public void onActionViewCollapsed() {
+        lastQuery = getQuery();
+        super.onActionViewCollapsed();
+    }
+
+    @Override
+    public void onActionViewExpanded() {
+        super.onActionViewExpanded();
+        setQuery(lastQuery, false);
+    }
+}

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -80,6 +80,7 @@ import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.PersistentSearchView;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.appcompat.widget.SearchView;
 import androidx.constraintlayout.widget.ConstraintLayout;
@@ -2327,12 +2328,14 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         inflater.inflate(R.menu.menu_messages, menu);
 
         final MenuItem menuSearch = menu.findItem(R.id.menu_search);
-        final SearchView searchView = (SearchView) menuSearch.getActionView();
+        final PersistentSearchView searchView = (PersistentSearchView) menuSearch.getActionView();
         searchView.setQueryHint(getString(R.string.title_search));
 
         if (!TextUtils.isEmpty(searching)) {
             menuSearch.expandActionView();
             searchView.setQuery(searching, false);
+        } else {
+            searchView.lastQuery = query;
         }
 
         AutoCompleteTextView autoCompleteTextView = searchView.findViewById(androidx.appcompat.R.id.search_src_text);

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

@@ -6,6 +6,6 @@
         android:id="@+id/menu_search"
         android:icon="@drawable/baseline_search_24"
         android:title="@string/title_search"
-        app:actionViewClass="androidx.appcompat.widget.SearchView"
+        app:actionViewClass="androidx.appcompat.widget.PersistentSearchView"
         app:showAsAction="collapseActionView|always" />
 </menu>

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

@@ -6,7 +6,7 @@
         android:id="@+id/menu_search"
         android:icon="@drawable/baseline_search_24"
         android:title="@string/title_search"
-        app:actionViewClass="androidx.appcompat.widget.SearchView"
+        app:actionViewClass="androidx.appcompat.widget.PersistentSearchView"
         app:showAsAction="collapseActionView|always" />
 
     <item

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

@@ -6,7 +6,7 @@
         android:id="@+id/menu_search"
         android:icon="@drawable/baseline_search_24"
         android:title="@string/title_search"
-        app:actionViewClass="androidx.appcompat.widget.SearchView"
+        app:actionViewClass="androidx.appcompat.widget.PersistentSearchView"
         app:showAsAction="collapseActionView|always" />
 
     <item

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

@@ -6,7 +6,7 @@
         android:id="@+id/menu_search"
         android:icon="@drawable/baseline_search_24"
         android:title="@string/title_search"
-        app:actionViewClass="androidx.appcompat.widget.SearchView"
+        app:actionViewClass="androidx.appcompat.widget.PersistentSearchView"
         app:showAsAction="collapseActionView|always" />
 
     <item