feat(StatusQ/TestHelpers): Add method to test model removing items and emiting layoutChanged

ui/StatusQ/tests/src/TestHelpers/testmodel.cpp

@@ -85,6 +85,9 @@ void TestModel::remove(int index)
 
 void TestModel::invert()
 {
+    if (m_data.size() < 2)
+        return;
+
     emit layoutAboutToBeChanged();
 
     for (auto& entry : m_data)
@@ -99,6 +102,32 @@ void TestModel::invert()
     emit layoutChanged();
 }
 
+void TestModel::removeEverySecond()
+{
+    if (m_data.empty())
+        return;
+
+    emit layoutAboutToBeChanged();
+
+    for (auto& entry : m_data) {
+        QVariantList& data = entry.second;
+
+        for (auto i = 0; i < data.size(); i++)
+            data.removeAt(i);
+    }
+
+    const auto persistentIndexes = persistentIndexList();
+
+    for (const QModelIndex& index : persistentIndexes) {
+        if (index.row() % 2 == 0)
+            changePersistentIndex(index, {});
+        else
+            changePersistentIndex(index, createIndex(index.row() / 2, 0));
+    }
+
+    emit layoutChanged();
+}
+
 void TestModel::initRoles()
 {
     m_roles.reserve(m_data.size());

ui/StatusQ/tests/src/TestHelpers/testmodel.h

@@ -19,6 +19,13 @@ public:
     // inverts order of items, emits layoutAboutToBeChanged / layoutChanged
     void invert();
 
+    // removes every second item from the model but doesn't emit
+    // rowsAboutToBeRemoved/rowsRemoved. The update is notified via
+    // layoutAboutToBeChanged/layoutChanged. It's useful for testing proxy
+    // models against that scenario, which may occur in some circumstances, e.g.
+    // during SFPM initialization where initial filtering is notified this way.
+    void removeEverySecond();
+
 private:
     void initRoles();