Use non-null valies for LB connection guards

Task-number: QTCREATORBUG-31024
Change-Id: I532d2daade968ff4aa2f3dc1ba89d2a3a4e9c2eb
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/fakevim/fakevimactions.cpp

@@ -199,7 +199,7 @@ FakeVimSettings::FakeVimSettings()
                         autoIndent.setValue(true);
                         smartIndent.setValue(tps.m_autoIndent);
                         incSearch.setValue(true);
-                    }, nullptr),
+                    }, this),
                 },
                 PushButton {
                     text(Tr::tr("Set Qt Style")),
@@ -213,7 +213,7 @@ FakeVimSettings::FakeVimSettings()
                         incSearch.setVolatileValue(true);
                         backspace.setVolatileValue(QString("indent,eol,start"));
                         passKeys.setVolatileValue(true);
-                    }, nullptr),
+                    }, this),
                 },
                 PushButton {
                     text(Tr::tr("Set Plain Style")),
@@ -227,7 +227,7 @@ FakeVimSettings::FakeVimSettings()
                         incSearch.setVolatileValue(false);
                         backspace.setVolatileValue(QString());
                         passKeys.setVolatileValue(false);
-                    }, nullptr),
+                    }, this),
                  },
                  st
             },

src/plugins/qbsprojectmanager/customqbspropertiesdialog.cpp

@@ -50,7 +50,7 @@ CustomQbsPropertiesDialog::CustomQbsPropertiesDialog(const QVariantMap &properti
             Column {
                 PushButton {
                     text(Tr::tr("&Add")),
-                    onClicked([this] { addProperty(); }, nullptr),
+                    onClicked([this] { addProperty(); }, this),
                 },
                 m_removeButton,
                 st

src/plugins/qbsprojectmanager/qbsprofilessettingspage.cpp

@@ -133,11 +133,11 @@ QbsProfilesSettingsWidget::QbsProfilesSettingsWidget()
             Column {
                 PushButton {
                     text(Tr::tr("E&xpand All")),
-                    onClicked([this] { m_propertiesView->expandAll(); }, nullptr),
+                    onClicked([this] { m_propertiesView->expandAll(); }, this),
                 },
                 PushButton {
                     text(Tr::tr("&Collapse All")),
-                    onClicked([this] { m_propertiesView->collapseAll(); }, nullptr),
+                    onClicked([this] { m_propertiesView->collapseAll(); }, this),
                 },
                 st,
             },

src/plugins/vcsbase/commonvcssettings.cpp

@@ -94,7 +94,7 @@ CommonVcsSettings::CommonVcsSettings()
                     text(Tr::tr("Reset VCS Cache")),
                     Layouting::toolTip(Tr::tr("Reset information about which "
                                               "version control system handles which directory.")),
-                    onClicked(&VcsManager::clearVersionControlCache, (QObject *)nullptr)
+                    onClicked(&VcsManager::clearVersionControlCache, this)
                 }
             }
         };

tests/manual/widgets/layoutbuilder/tst_manual_widgets_layoutbuilder.cpp

@@ -24,9 +24,9 @@ int main(int argc, char *argv[])
     };
 
     Row {
-        PushButton { text("-"), onClicked(minusClick, nullptr) },
+        PushButton { text("-"), onClicked(minusClick, qApp) },
         lineEdit,
-        PushButton { text("+"), onClicked(plusClick, nullptr) },
+        PushButton { text("+"), onClicked(plusClick, qApp) },
         Group {
             title("Splitter in Group"),
             Column {