3 files changed, 5 insertions, 5 deletions
diff --git a/src/widgets/kernel/qdesktopwidget.cpp b/src/widgets/kernel/qdesktopwidget.cpp
index b4cb3bae18..e85c6504a7 100644
--- a/src/widgets/kernel/qdesktopwidget.cpp
+++ b/src/widgets/kernel/qdesktopwidget.cpp
@@ -203,7 +203,7 @@ int QDesktopWidget::screenNumber(const QWidget *w) const
         return primaryScreen();
 
     // If there is more than one virtual desktop
-    if (screens.count() != screens.first()->virtualSiblings().count()) {
+    if (screens.count() != screens.constFirst()->virtualSiblings().count()) {
         // Find the root widget, get a QScreen from it and use the
         // virtual siblings for checking the window position.
         const QWidget *root = w;
diff --git a/src/widgets/util/qcompleter.cpp b/src/widgets/util/qcompleter.cpp
index 55ceeca919..3eeb6683b1 100644
--- a/src/widgets/util/qcompleter.cpp
+++ b/src/widgets/util/qcompleter.cpp
@@ -432,7 +432,7 @@ void QCompletionEngine::filter(const QStringList& parts)
 
     QModelIndex parent;
     for (int i = 0; i < curParts.count() - 1; i++) {
-        QString part = curParts[i];
+        QString part = curParts.at(i);
         int emi = filter(part, parent, -1).exactMatchIndex;
         if (emi == -1)
             return;
@@ -442,10 +442,10 @@ void QCompletionEngine::filter(const QStringList& parts)
     // Note that we set the curParent to a valid parent, even if we have no matches
     // When filtering is disabled, we show all the items under this parent
     curParent = parent;
-    if (curParts.last().isEmpty())
+    if (curParts.constLast().isEmpty())
         curMatch = QMatchData(QIndexMapper(0, model->rowCount(curParent) - 1), -1, false);
     else
-        curMatch = filter(curParts.last(), curParent, 1); // build at least one
+        curMatch = filter(curParts.constLast(), curParent, 1); // build at least one
     curRow = curMatch.isValid() ? 0 : -1;
 }
 
diff --git a/src/widgets/widgets/qdialogbuttonbox.cpp b/src/widgets/widgets/qdialogbuttonbox.cpp
index e262f2db22..cad5e6f9e4 100644
--- a/src/widgets/widgets/qdialogbuttonbox.cpp
+++ b/src/widgets/widgets/qdialogbuttonbox.cpp
@@ -261,7 +261,7 @@ void QDialogButtonBoxPrivate::layoutButtons()
     if (center)
         buttonLayout->addStretch();
 
-    QList<QAbstractButton *> acceptRoleList = buttonLists[QPlatformDialogHelper::AcceptRole];
+    const QList<QAbstractButton *> &acceptRoleList = buttonLists[QPlatformDialogHelper::AcceptRole];
 
     while (*currentLayout != QPlatformDialogHelper::EOL) {
         int role = (*currentLayout & ~QPlatformDialogHelper::Reverse);