Gui: fix clazy warnings:

* Wclazy-connect-by-name
* Wclazy-connect-3arg-lambda

src/Gui/DlgCreateNewPreferencePackImp.cpp

@@ -53,6 +53,7 @@ DlgCreateNewPreferencePackImp::DlgCreateNewPreferencePackImp(QWidget* parent)
     ui->lineEdit->setValidator(&_nameValidator);
     ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
     connect(ui->treeWidget, &QTreeWidget::itemChanged, this, &DlgCreateNewPreferencePackImp::onItemChanged);
+    connect(ui->lineEdit, &QLineEdit::textEdited, this, &DlgCreateNewPreferencePackImp::onLineEditTextEdited);
 }
 
 
@@ -147,7 +148,7 @@ void DlgCreateNewPreferencePackImp::onItemChanged(QTreeWidgetItem* item, int col
     }
 }
 
-void DlgCreateNewPreferencePackImp::on_lineEdit_textEdited(const QString& text)
+void DlgCreateNewPreferencePackImp::onLineEditTextEdited(const QString& text)
 {
     ui->buttonBox->button(QDialogButtonBox::Ok)->setDisabled(text.isEmpty());
 }

src/Gui/DlgCreateNewPreferencePackImp.h

@@ -64,7 +64,7 @@ protected Q_SLOTS:
 
     void onItemChanged(QTreeWidgetItem* item, int column);
 
-    void on_lineEdit_textEdited(const QString &text);
+    void onLineEditTextEdited(const QString &text);
 
     void accept() override;
 

src/Gui/DlgGeneralImp.cpp

@@ -431,11 +431,12 @@ void DlgGeneralImp::saveAsNewPreferencePack()
 void DlgGeneralImp::revertToSavedConfig()
 {
     revertToBackupConfigDialog = std::make_unique<DlgRevertToBackupConfigImp>(this);
-    connect(revertToBackupConfigDialog.get(), &DlgRevertToBackupConfigImp::accepted, [this]() {
+    connect(revertToBackupConfigDialog.get(), &DlgRevertToBackupConfigImp::accepted, this, [this]() {
         auto parentDialog = qobject_cast<DlgPreferencesImp*> (this->window());
-        if (parentDialog)
+        if (parentDialog) {
             parentDialog->reload();
-        });
+        }
+    });
     revertToBackupConfigDialog->open();
 }
 

src/Gui/DlgPreferencesImp.cpp

@@ -24,7 +24,7 @@
 #ifndef _PreComp_
 # include <algorithm>
 # include <cstring>
-
+# include <QAbstractButton>
 # include <QApplication>
 # include <QDebug>
 # include <QGenericReturnArgument>
@@ -75,10 +75,12 @@ DlgPreferencesImp::DlgPreferencesImp(QWidget* parent, Qt::WindowFlags fl)
     ui->listBox->setFixedWidth(Base::clamp<int>(length + 20, 108, 120));
     ui->listBox->setGridSize(QSize(108, 75));
 
-    connect(ui->buttonBox,  SIGNAL (helpRequested()),
-            getMainWindow(), SLOT (whatsThis()));
-    connect(ui->listBox, SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)),
-            this, SLOT(changeGroup(QListWidgetItem *, QListWidgetItem*)));
+    connect(ui->buttonBox, &QDialogButtonBox::clicked,
+            this, &DlgPreferencesImp::onButtonBoxClicked);
+    connect(ui->buttonBox,  &QDialogButtonBox::helpRequested,
+            getMainWindow(), &MainWindow::whatsThis);
+    connect(ui->listBox, &QListWidget::currentItemChanged,
+            this, &DlgPreferencesImp::changeGroup);
 
     setupPages();
 
@@ -316,7 +318,7 @@ void DlgPreferencesImp::accept()
         QDialog::accept();
 }
 
-void DlgPreferencesImp::on_buttonBox_clicked(QAbstractButton* btn)
+void DlgPreferencesImp::onButtonBoxClicked(QAbstractButton* btn)
 {
     if (ui->buttonBox->standardButton(btn) == QDialogButtonBox::Apply)
         applyChanges();

src/Gui/DlgPreferencesImp.h

@@ -133,7 +133,7 @@ protected:
 
 protected Q_SLOTS:
     void changeGroup(QListWidgetItem *current, QListWidgetItem *previous);
-    void on_buttonBox_clicked(QAbstractButton*);
+    void onButtonBoxClicked(QAbstractButton*);
     void resizeWindow(int w, int h);
 
 private: