2 files changed, 42 insertions, 2 deletions
diff --git a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
index 3a3e38ba75..0098c5d884 100644
--- a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
+++ b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
@@ -286,8 +286,8 @@ retry:
 // Testing get/set functions
 void tst_QCompleter::getSetCheck()
 {
-    QStandardItemModel model(3,3);
-    QCompleter completer(&model);
+    QStandardItemModel standardItemModel(3,3);
+    QCompleter completer(&standardItemModel);
 
     // QString QCompleter::completionPrefix()
     // void QCompleter::setCompletionPrefix(QString)
@@ -347,6 +347,21 @@ void tst_QCompleter::getSetCheck()
     QCOMPARE(completer.wrapAround(), true); // default value
     completer.setWrapAround(false);
     QCOMPARE(completer.wrapAround(), false);
+
+#ifndef QT_NO_FILESYSTEMMODEL
+    // QTBUG-54642, changing from QFileSystemModel to another model should restore role.
+    completer.setCompletionRole(Qt::EditRole);
+    QCOMPARE(completer.completionRole(), static_cast<int>(Qt::EditRole)); // default value
+    QFileSystemModel fileSystemModel;
+    completer.setModel(&fileSystemModel);
+    QCOMPARE(completer.completionRole(), static_cast<int>(QFileSystemModel::FileNameRole));
+    completer.setModel(&standardItemModel);
+    QCOMPARE(completer.completionRole(), static_cast<int>(Qt::EditRole));
+    completer.setCompletionRole(Qt::ToolTipRole);
+    QStandardItemModel standardItemModel2(2, 2); // Do not clobber a custom role when changing models
+    completer.setModel(&standardItemModel2);
+    QCOMPARE(completer.completionRole(), static_cast<int>(Qt::ToolTipRole));
+#endif // QT_NO_FILESYSTEMMODEL
 }
 
 void tst_QCompleter::csMatchingOnCsSortedModel_data()
diff --git a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
index 1ae33ef7a1..816fe1faba 100644
--- a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
+++ b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
@@ -153,6 +153,7 @@ private slots:
     void itemData();
     void task_QTBUG_31146_popupCompletion();
     void task_QTBUG_41288_completerChangesCurrentIndex();
+    void task_QTBUG_54191_slotOnEditTextChangedSetsComboBoxToReadOnly();
     void keyboardSelection();
     void setCustomModelAndView();
     void updateDelegateOnEditableChange();
@@ -3111,6 +3112,30 @@ void tst_QComboBox::task_QTBUG_41288_completerChangesCurrentIndex()
     }
 }
 
+namespace {
+    struct SetReadOnly {
+        QComboBox *cb;
+        explicit SetReadOnly(QComboBox *cb) : cb(cb) {}
+        void operator()() const
+        { cb->setEditable(false); }
+    };
+}
+
+void tst_QComboBox::task_QTBUG_54191_slotOnEditTextChangedSetsComboBoxToReadOnly()
+{
+    QComboBox cb;
+    cb.addItems(QStringList() << "one" << "two");
+    cb.setEditable(true);
+    cb.setCurrentIndex(0);
+
+    connect(&cb, &QComboBox::editTextChanged,
+            SetReadOnly(&cb));
+
+    cb.setCurrentIndex(1);
+    // the real test is that it didn't crash...
+    QCOMPARE(cb.currentIndex(), 1);
+}
+
 void tst_QComboBox::keyboardSelection()
 {
     QComboBox comboBox;