search: add menu allowing toggling is:unread

src/main/java/org/thoughtcrime/securesms/components/SearchToolbar.java

@@ -27,6 +27,7 @@ public class SearchToolbar extends LinearLayout {
   private static final String TAG = SearchToolbar.class.getSimpleName();
   private float x, y;
   private MenuItem searchItem;
+  private EditText searchText;
   private SearchListener listener;
 
   public SearchToolbar(Context context) {
@@ -63,7 +64,7 @@ public class SearchToolbar extends LinearLayout {
 
     this.searchItem = toolbar.getMenu().findItem(R.id.action_filter_search);
     SearchView searchView = (SearchView) searchItem.getActionView();
-    EditText   searchText = searchView.findViewById(androidx.appcompat.R.id.search_src_text);
+    searchText = searchView.findViewById(androidx.appcompat.R.id.search_src_text);
     searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);
 
     searchView.setSubmitButtonEnabled(false);
@@ -107,6 +108,17 @@ public class SearchToolbar extends LinearLayout {
       }
     });
 
+    MenuItem searchUnread = toolbar.getMenu().findItem(R.id.search_unread);
+    searchUnread.setOnMenuItemClickListener(item -> {
+      String t = searchText.getText().toString();
+      if (!t.contains("is:unread")) {
+        t += (t.isEmpty() ? "" : " ") + "is:unread ";
+      }
+      searchText.setText(t);
+      searchText.setSelection(t.length(), t.length());
+      return true;
+    });
+
     toolbar.setNavigationOnClickListener(v -> hide());
   }
 

src/main/res/menu/conversation_list_search.xml

@@ -8,4 +8,8 @@
             app:actionViewClass="androidx.appcompat.widget.SearchView"
             app:showAsAction="collapseActionView|always" />
 
-</menu>
+    <item android:title="@string/search_unread"
+        android:id="@+id/search_unread"
+        app:showAsAction="never"/>
+
+</menu>

src/main/res/values/strings.xml

@@ -466,6 +466,7 @@
     <string name="search_files">Search Files</string>
     <string name="search_explain">Search for chats, contacts, and messages</string>
     <string name="search_no_result_for_x">No results found for \"%s\"</string>
+    <string name="search_unread">Unread</string>
 
 
     <!-- create/edit groups, contact/group profile -->