diff --git a/src/composite.cpp b/src/composite.cpp
index 283efc8473..618d3e7677 100644
--- a/src/composite.cpp
+++ b/src/composite.cpp
@@ -455,10 +455,12 @@ void Compositor::stop()
     }
 
     if (waylandServer()) {
-        for (AbstractClient *c : waylandServer()->clients()) {
+        const QList<AbstractClient *> toRemoveTopLevel = waylandServer()->clients();
+        for (AbstractClient *c : toRemoveTopLevel) {
             m_scene->removeToplevel(c);
         }
-        for (AbstractClient *c : waylandServer()->clients()) {
+        const QList<AbstractClient *> toFinishCompositing = waylandServer()->clients();
+        for (AbstractClient *c : toFinishCompositing) {
             c->finishCompositing();
         }
     }
@@ -591,7 +593,8 @@ void Compositor::composite(RenderLoop *renderLoop)
     QList<Toplevel *> windows = Workspace::self()->xStackingOrder();
 
     // Move elevated windows to the top of the stacking order
-    for (EffectWindow *c : static_cast<EffectsHandlerImpl *>(effects)->elevatedWindows()) {
+    const QList<EffectWindow *> elevatedList = static_cast<EffectsHandlerImpl *>(effects)->elevatedWindows();
+    for (EffectWindow *c : elevatedList) {
         Toplevel *t = static_cast<EffectWindowImpl *>(c)->window();
         windows.removeAll(t);
         windows.append(t);
diff --git a/src/dbusinterface.cpp b/src/dbusinterface.cpp
index bc0fe8a631..2884435b6d 100644
--- a/src/dbusinterface.cpp
+++ b/src/dbusinterface.cpp
@@ -387,7 +387,8 @@ VirtualDesktopManagerDBusInterface::VirtualDesktopManagerDBusInterface(VirtualDe
 
     connect(m_manager, &VirtualDesktopManager::rowsChanged, this, &VirtualDesktopManagerDBusInterface::rowsChanged);
 
-    for (auto *vd : m_manager->desktops()) {
+    const QVector<VirtualDesktop *> allDesks = m_manager->desktops();
+    for (auto *vd : allDesks) {
         connect(vd, &VirtualDesktop::x11DesktopNumberChanged, this,
             [this, vd]() {
                 DBusDesktopDataStruct data{.position = vd->x11DesktopNumber() - 1, .id = vd->id(), .name = vd->name()};
diff --git a/src/effects/backgroundcontrast/contrast.cpp b/src/effects/backgroundcontrast/contrast.cpp
index e9648f7c5e..c5f9c37045 100644
--- a/src/effects/backgroundcontrast/contrast.cpp
+++ b/src/effects/backgroundcontrast/contrast.cpp
@@ -52,7 +52,8 @@ ContrastEffect::ContrastEffect()
     );
 
     // Fetch the contrast regions for all windows
-    for (EffectWindow *window: effects->stackingOrder()) {
+    const EffectWindowList windowList = effects->stackingOrder();
+    for (EffectWindow *window : windowList) {
         updateContrastRegion(window);
     }
 }
@@ -69,7 +70,9 @@ void ContrastEffect::slotScreenGeometryChanged()
         effects->reloadEffect(this);
         return;
     }
-    for (EffectWindow *window: effects->stackingOrder()) {
+
+    const EffectWindowList windowList = effects->stackingOrder();
+    for (EffectWindow *window : windowList) {
         updateContrastRegion(window);
     }
 }
diff --git a/src/effects/desktopgrid/desktopgrid.cpp b/src/effects/desktopgrid/desktopgrid.cpp
index 1793c47c40..d66abbc1bb 100644
--- a/src/effects/desktopgrid/desktopgrid.cpp
+++ b/src/effects/desktopgrid/desktopgrid.cpp
@@ -179,7 +179,8 @@ void DesktopGridEffect::prePaintScreen(ScreenPrePaintData& data, std::chrono::mi
             finish();
     }
 
-    for (auto const &w : effects->stackingOrder()) {
+    const EffectWindowList windows = effects->stackingOrder();
+    for (auto *w : windows) {
         w->setData(WindowForceBlurRole, QVariant(true));
     }
 
@@ -1377,7 +1378,9 @@ QVector<int> DesktopGridEffect::desktopList(const EffectWindow *w) const
     QVector<int> desks;
     desks.resize(w->desktops().count());
     int i = 0;
-    for (const int desk : w->desktops()) {
+
+    const QVector<uint> allDesks = w->desktops();
+    for (const int desk : allDesks) {
         desks[i++] = desk-1;
     }
     return desks;
diff --git a/src/effects/overview/overvieweffect.cpp b/src/effects/overview/overvieweffect.cpp
index c4d6052dd2..64597cdacc 100644
--- a/src/effects/overview/overvieweffect.cpp
+++ b/src/effects/overview/overvieweffect.cpp
@@ -246,7 +246,7 @@ void OverviewEffect::activate()
 
 void OverviewEffect::deactivate()
 {
-    for (OverviewScreenView *screenView : m_screenViews) {
+    for (OverviewScreenView *screenView : std::as_const(m_screenViews)) {
         screenView->stop();
     }
     m_shutdownTimer->start(animationDuration());
diff --git a/src/effects/slideback/slideback.cpp b/src/effects/slideback/slideback.cpp
index 37dfa484e5..ccda0e21d9 100644
--- a/src/effects/slideback/slideback.cpp
+++ b/src/effects/slideback/slideback.cpp
@@ -139,7 +139,8 @@ void SlideBackEffect::prePaintScreen(ScreenPrePaintData &data, std::chrono::mill
         data.mask |= Effect::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
     }
 
-    for (auto const &w : effects->stackingOrder()) {
+    const EffectWindowList windows = effects->stackingOrder();
+    for (auto *w : windows) {
         w->setData(WindowForceBlurRole, QVariant(true));
     }
 
diff --git a/src/input.cpp b/src/input.cpp
index b0cd73c235..81de7e64c3 100644
--- a/src/input.cpp
+++ b/src/input.cpp
@@ -2302,7 +2302,8 @@ void InputRedirection::setupInputFilters()
 
         if (m_libInput) {
             m_tabletSupport = new TabletInputFilter;
-            for (LibInput::Device *dev : m_libInput->devices()) {
+            const QVector<LibInput::Device *> devices = m_libInput->devices();
+            for (LibInput::Device *dev : devices) {
                 m_tabletSupport->integrateDevice(dev);
             }
             connect(m_libInput, &LibInput::Connection::deviceAdded, m_tabletSupport, &TabletInputFilter::integrateDevice);
diff --git a/src/kcmkwin/kwincompositing/kwincompositingdata.cpp b/src/kcmkwin/kwincompositing/kwincompositingdata.cpp
index 41b1ee1b85..5791a43c6b 100644
--- a/src/kcmkwin/kwincompositing/kwincompositingdata.cpp
+++ b/src/kcmkwin/kwincompositing/kwincompositingdata.cpp
@@ -21,7 +21,9 @@ KWinCompositingData::KWinCompositingData(QObject *parent, const QVariantList &ar
 bool KWinCompositingData::isDefaults() const
 {
     bool defaults = true;
-    for (const auto &item : m_settings->items()) {
+
+    const KConfigSkeletonItem::List itemList = m_settings->items();
+    for (const auto &item : itemList) {
         if (item->key() != QStringLiteral("OpenGLIsUnsafe")) {
             defaults &= item->isDefault();
         }
diff --git a/src/kcmkwin/kwinrules/kcmrules.cpp b/src/kcmkwin/kwinrules/kcmrules.cpp
index 822050c609..2f6c3f572e 100644
--- a/src/kcmkwin/kwinrules/kcmrules.cpp
+++ b/src/kcmkwin/kwinrules/kcmrules.cpp
@@ -260,7 +260,8 @@ void KCMKWinRules::exportToFile(const QUrl &path, const QList<int> &indexes)
 
     const auto config = KSharedConfig::openConfig(path.toLocalFile(), KConfig::SimpleConfig);
 
-    for (const QString &groupName : config->groupList()) {
+    const QStringList groups = config->groupList();
+    for (const QString &groupName : groups) {
         config->deleteGroup(groupName);
     }
 
diff --git a/src/kcmkwin/kwinrules/rulebookmodel.cpp b/src/kcmkwin/kwinrules/rulebookmodel.cpp
index f28c71feeb..f3e5df8cff 100644
--- a/src/kcmkwin/kwinrules/rulebookmodel.cpp
+++ b/src/kcmkwin/kwinrules/rulebookmodel.cpp
@@ -187,7 +187,8 @@ bool RuleBookModel::isSaveNeeded()
 void RuleBookModel::copySettingsTo(RuleSettings *dest, const RuleSettings &source)
 {
     dest->setDefaults();
-    for (const KConfigSkeletonItem *item : source.items()) {
+    const KConfigSkeletonItem::List itemList = source.items();
+    for (const KConfigSkeletonItem *item : itemList) {
         dest->findItem(item->name())->setProperty(item->property());
     }
 }
diff --git a/src/virtualdesktops.cpp b/src/virtualdesktops.cpp
index 0f4e6eeeee..2d1b1d19c9 100644
--- a/src/virtualdesktops.cpp
+++ b/src/virtualdesktops.cpp
@@ -104,7 +104,8 @@ void VirtualDesktopManager::setVirtualDesktopManagement(KWaylandServer::PlasmaVi
 
     connect(this, &VirtualDesktopManager::currentChanged, m_virtualDesktopManagement,
         [this]() {
-            for (auto *deskInt : m_virtualDesktopManagement->desktops()) {
+            const QList <PlasmaVirtualDesktopInterface *> deskIfaces = m_virtualDesktopManagement->desktops();
+            for (auto *deskInt : deskIfaces) {
                 if (deskInt->id() == currentDesktop()->id()) {
                     deskInt->setActive(true);
                 } else {
diff --git a/src/wayland_server.cpp b/src/wayland_server.cpp
index 136d37dac1..6ef2042fff 100644
--- a/src/wayland_server.cpp
+++ b/src/wayland_server.cpp
@@ -636,7 +636,8 @@ void WaylandServer::initScreenLocker()
             }
             ScreenLocker::KSldApp::self()->setWaylandFd(clientFd);
 
-            for (auto *seat : m_display->seats()) {
+            const QVector<SeatInterface *> seatIfaces = m_display->seats();
+            for (auto *seat : seatIfaces) {
                 connect(seat, &KWaylandServer::SeatInterface::timestampChanged,
                         screenLockerApp, &ScreenLocker::KSldApp::userActivity);
             }
@@ -651,7 +652,8 @@ void WaylandServer::initScreenLocker()
                 m_screenLockerClientConnection = nullptr;
             }
 
-            for (auto *seat : m_display->seats()) {
+            const QVector<SeatInterface *> seatIfaces = m_display->seats();
+            for (auto *seat : seatIfaces) {
                 disconnect(seat, &KWaylandServer::SeatInterface::timestampChanged,
                            screenLockerApp, &ScreenLocker::KSldApp::userActivity);
             }