Remove filtered children if the parent folder is collapsed

This is analogous to commit e053ecdcd57cc39fdcbc314fc8dd22c8b9dbdd4f,
which fixes the same problem for the case that the parent folder is
deleted.

BUG: 316335
FIXED-IN: 4.10.2
REVIEW: 109343

2 files changed, 73 insertions, 0 deletions

diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index d4c08a52e..792724502 100644
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -438,6 +438,29 @@ bool KFileItemModel::setExpanded(int index, bool expanded)
             itemsToRemove.append(m_itemData.at(index)->item);
             ++index;
         }
+
+        QSet<KUrl> urlsToRemove;
+        urlsToRemove.reserve(itemsToRemove.count() + 1);
+        urlsToRemove.insert(url);
+        foreach (const KFileItem& item, itemsToRemove) {
+            KUrl url = item.url();
+            url.adjustPath(KUrl::RemoveTrailingSlash);
+            urlsToRemove.insert(url);
+        }
+
+        QSet<KFileItem>::iterator it = m_filteredItems.begin();
+        while (it != m_filteredItems.end()) {
+            const KUrl url = it->url();
+            KUrl parentUrl = url.upUrl();
+            parentUrl.adjustPath(KUrl::RemoveTrailingSlash);
+
+            if (urlsToRemove.contains(parentUrl)) {
+                it = m_filteredItems.erase(it);
+            } else {
+                ++it;
+            }
+        }
+
         removeItems(itemsToRemove);
     }
 
diff --git a/src/tests/kfileitemmodeltest.cpp b/src/tests/kfileitemmodeltest.cpp
index b76f4bee9..58e83ac68 100644
--- a/src/tests/kfileitemmodeltest.cpp
+++ b/src/tests/kfileitemmodeltest.cpp
@@ -76,6 +76,7 @@ private slots:
     void testNameFilter();
     void testEmptyPath();
     void testRemoveHiddenItems();
+    void collapseParentOfHiddenItems();
     void removeParentOfHiddenItems();
 
 private:
@@ -851,6 +852,55 @@ void KFileItemModelTest::testRemoveHiddenItems()
 }
 
 /**
+ * Verify that filtered items are removed when their parent is collapsed.
+ */
+void KFileItemModelTest::collapseParentOfHiddenItems()
+{
+    QSet<QByteArray> modelRoles = m_model->roles();
+    modelRoles << "isExpanded" << "isExpandable" << "expandedParentsCount";
+    m_model->setRoles(modelRoles);
+
+    QStringList files;
+    files << "a/1" << "a/b/1" << "a/b/c/1" << "a/b/c/d/1";
+    m_testDir->createFiles(files);
+
+    m_model->loadDirectory(m_testDir->url());
+    QVERIFY(QTest::kWaitForSignal(m_model, SIGNAL(itemsInserted(KItemRangeList)), DefaultTimeout));
+    QCOMPARE(m_model->count(), 1); // Only "a/"
+
+    // Expand "a/".
+    m_model->setExpanded(0, true);
+    QVERIFY(QTest::kWaitForSignal(m_model, SIGNAL(itemsInserted(KItemRangeList)), DefaultTimeout));
+    QCOMPARE(m_model->count(), 3); // 3 items: "a/", "a/b/", "a/1"
+
+    // Expand "a/b/".
+    m_model->setExpanded(1, true);
+    QVERIFY(QTest::kWaitForSignal(m_model, SIGNAL(itemsInserted(KItemRangeList)), DefaultTimeout));
+    QCOMPARE(m_model->count(), 5); // 5 items: "a/", "a/b/", "a/b/c", "a/b/1", "a/1"
+
+    // Expand "a/b/c/".
+    m_model->setExpanded(2, true);
+    QVERIFY(QTest::kWaitForSignal(m_model, SIGNAL(itemsInserted(KItemRangeList)), DefaultTimeout));
+    QCOMPARE(m_model->count(), 7); // 7 items: "a/", "a/b/", "a/b/c", "a/b/c/d/", "a/b/c/1", "a/b/1", "a/1"
+
+    // Set a name filter that matches nothing -> only the expanded folders remain.
+    m_model->setNameFilter("xyz");
+    QCOMPARE(m_model->count(), 3);
+    QCOMPARE(itemsInModel(), QStringList() << "a" << "b" << "c");
+
+    // Collapse the folder "a/".
+    QSignalSpy spyItemsRemoved(m_model, SIGNAL(itemsRemoved(KItemRangeList)));
+    m_model->setExpanded(0, false);
+    QCOMPARE(spyItemsRemoved.count(), 1);
+    QCOMPARE(m_model->count(), 1);
+    QCOMPARE(itemsInModel(), QStringList() << "a");
+
+    // Remove the filter -> no files should appear (and we should not get a crash).
+    m_model->setNameFilter(QString());
+    QCOMPARE(m_model->count(), 1);
+}
+
+/**
  * Verify that filtered items are removed when their parent is deleted.
  */
 void KFileItemModelTest::removeParentOfHiddenItems()