Use nullptr here too

src/lib/3rdparty/lineedit.h

@@ -92,7 +92,7 @@ public:
         SelectAll = 8
     };
 
-    LineEdit(QWidget* parent = 0);
+    LineEdit(QWidget* parent = nullptr);
 
     void addWidget(QWidget* widget, WidgetPosition position);
     void removeWidget(QWidget* widget);
@@ -152,7 +152,7 @@ Q_SIGNALS:
     void sizeHintChanged();
 
 public:
-    SideWidget(QWidget* parent = 0);
+    SideWidget(QWidget* parent = nullptr);
 
 protected:
     bool event(QEvent* event) override;

src/lib/3rdparty/squeezelabelv1.h

@@ -42,7 +42,7 @@ class FALKON_EXPORT SqueezeLabelV1 : public QLabel
     Q_OBJECT
 
 public:
-    SqueezeLabelV1(QWidget* parent = 0);
+    SqueezeLabelV1(QWidget* parent = nullptr);
 
 protected:
     void paintEvent(QPaintEvent* event) override;

src/lib/adblock/adblockaddsubscriptiondialog.h

@@ -33,7 +33,7 @@ class FALKON_EXPORT AdBlockAddSubscriptionDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit AdBlockAddSubscriptionDialog(QWidget* parent = 0);
+    explicit AdBlockAddSubscriptionDialog(QWidget* parent = nullptr);
     ~AdBlockAddSubscriptionDialog();
 
     QString title() const;

src/lib/adblock/adblocktreewidget.h

@@ -28,7 +28,7 @@ class FALKON_EXPORT AdBlockTreeWidget : public TreeWidget
 {
     Q_OBJECT
 public:
-    explicit AdBlockTreeWidget(AdBlockSubscription* subscription, QWidget* parent = 0);
+    explicit AdBlockTreeWidget(AdBlockSubscription* subscription, QWidget* parent = nullptr);
 
     AdBlockSubscription* subscription() const;
 

src/lib/app/mainmenu.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT MainMenu : public QMenu
     Q_OBJECT
 
 public:
-    explicit MainMenu(BrowserWindow* window, QWidget* parent = 0);
+    explicit MainMenu(BrowserWindow* window, QWidget* parent = nullptr);
 
 
     void initMenuBar(QMenuBar* menuBar) const;

src/lib/autofill/passwordbackends/databaseencryptedpasswordbackend.h

@@ -101,7 +101,7 @@ class MasterPasswordDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit MasterPasswordDialog(DatabaseEncryptedPasswordBackend* backend, QWidget* parent = 0);
+    explicit MasterPasswordDialog(DatabaseEncryptedPasswordBackend* backend, QWidget* parent = nullptr);
     ~MasterPasswordDialog();
 
     void delayedExec();
@@ -128,7 +128,7 @@ class AskMasterPassword : public QDialog
     Q_OBJECT
 
 public:
-    explicit AskMasterPassword(DatabaseEncryptedPasswordBackend* backend, QWidget* parent = 0);
+    explicit AskMasterPassword(DatabaseEncryptedPasswordBackend* backend, QWidget* parent = nullptr);
 
 private Q_SLOTS:
     void verifyPassword();

src/lib/bookmarks/bookmarksexport/bookmarksexportdialog.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT BookmarksExportDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit BookmarksExportDialog(QWidget* parent = 0);
+    explicit BookmarksExportDialog(QWidget* parent = nullptr);
     ~BookmarksExportDialog();
 
 private Q_SLOTS:

src/lib/bookmarks/bookmarksicon.h

@@ -30,7 +30,7 @@ class FALKON_EXPORT BookmarksIcon : public ClickableLabel
 {
     Q_OBJECT
 public:
-    explicit BookmarksIcon(QWidget* parent = 0);
+    explicit BookmarksIcon(QWidget* parent = nullptr);
 
     void setWebView(WebView* view);
     void checkBookmark(const QUrl &url, bool forceCheck = false);

src/lib/bookmarks/bookmarksimport/bookmarksimportdialog.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT BookmarksImportDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit BookmarksImportDialog(QWidget* parent = 0);
+    explicit BookmarksImportDialog(QWidget* parent = nullptr);
     ~BookmarksImportDialog();
 
 private Q_SLOTS:

src/lib/bookmarks/bookmarksmanager.h

@@ -39,7 +39,7 @@ class FALKON_EXPORT BookmarksManager : public QWidget
     Q_OBJECT
 
 public:
-    explicit BookmarksManager(BrowserWindow* window, QWidget* parent = 0);
+    explicit BookmarksManager(BrowserWindow* window, QWidget* parent = nullptr);
     ~BookmarksManager();
 
     void setMainWindow(BrowserWindow* window);

src/lib/bookmarks/bookmarksmenu.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT BookmarksMenu : public Menu
     Q_OBJECT
 
 public:
-    explicit BookmarksMenu(QWidget* parent = 0);
+    explicit BookmarksMenu(QWidget* parent = nullptr);
 
     void setMainWindow(BrowserWindow* window);
 

src/lib/bookmarks/bookmarkstoolbar.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT BookmarksToolbar : public QWidget
 {
     Q_OBJECT
 public:
-    explicit BookmarksToolbar(BrowserWindow* window, QWidget* parent = 0);
+    explicit BookmarksToolbar(BrowserWindow* window, QWidget* parent = nullptr);
 
 private Q_SLOTS:
     void contextMenuRequested(const QPoint &pos);

src/lib/bookmarks/bookmarkstoolbarbutton.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT BookmarksToolbarButton : public QPushButton
     Q_OBJECT
 
 public:
-    explicit BookmarksToolbarButton(BookmarkItem* bookmark, QWidget* parent = 0);
+    explicit BookmarksToolbarButton(BookmarkItem* bookmark, QWidget* parent = nullptr);
 
     BookmarkItem* bookmark() const;
     void setMainWindow(BrowserWindow* window);

src/lib/bookmarks/bookmarkstools.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT BookmarksFoldersMenu : public QMenu
     Q_OBJECT
 
 public:
-    explicit BookmarksFoldersMenu(QWidget* parent = 0);
+    explicit BookmarksFoldersMenu(QWidget* parent = nullptr);
 
     BookmarkItem* selectedFolder() const;
 

src/lib/bookmarks/bookmarkstreeview.h

@@ -37,7 +37,7 @@ public:
         BookmarksSidebarViewType
     };
 
-    explicit BookmarksTreeView(QWidget* parent = 0);
+    explicit BookmarksTreeView(QWidget* parent = nullptr);
 
     ViewType viewType() const;
     void setViewType(ViewType type);

src/lib/bookmarks/bookmarkswidget.h

@@ -37,7 +37,7 @@ class FALKON_EXPORT BookmarksWidget : public LocationBarPopup
 {
     Q_OBJECT
 public:
-    explicit BookmarksWidget(WebView* view, BookmarkItem* bookmark, QWidget* parent = 0);
+    explicit BookmarksWidget(WebView* view, BookmarkItem* bookmark, QWidget* parent = nullptr);
     ~BookmarksWidget();
 
 private Q_SLOTS:

src/lib/downloads/downloadmanager.h

@@ -59,7 +59,7 @@ public:
         }
     };
 
-    explicit DownloadManager(QWidget* parent = 0);
+    explicit DownloadManager(QWidget* parent = nullptr);
     ~DownloadManager();
 
     void loadSettings();

src/lib/downloads/downloadoptionsdialog.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT DownloadOptionsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit DownloadOptionsDialog(const QString &fileName, QWebEngineDownloadItem *downloadItem, QWidget* parent = 0);
+    explicit DownloadOptionsDialog(const QString &fileName, QWebEngineDownloadItem *downloadItem, QWidget* parent = nullptr);
     ~DownloadOptionsDialog();
 
     void showExternalManagerOption(bool show);

src/lib/history/historymanager.h

@@ -38,7 +38,7 @@ class FALKON_EXPORT HistoryManager : public QWidget
     Q_OBJECT
 
 public:
-    explicit HistoryManager(BrowserWindow* window, QWidget* parent = 0);
+    explicit HistoryManager(BrowserWindow* window, QWidget* parent = nullptr);
     ~HistoryManager();
 
     void setMainWindow(BrowserWindow* window);

src/lib/history/historymenu.h

@@ -30,7 +30,7 @@ class FALKON_EXPORT HistoryMenu : public Menu
     Q_OBJECT
 
 public:
-    explicit HistoryMenu(QWidget* parent = 0);
+    explicit HistoryMenu(QWidget* parent = nullptr);
 
     void setMainWindow(BrowserWindow* window);
 

src/lib/history/historytreeview.h

@@ -33,7 +33,7 @@ public:
         HistorySidebarViewType
     };
 
-    explicit HistoryTreeView(QWidget* parent = 0);
+    explicit HistoryTreeView(QWidget* parent = nullptr);
 
     ViewType viewType() const;
     void setViewType(ViewType type);

src/lib/navigation/downicon.h

@@ -24,7 +24,7 @@
 class FALKON_EXPORT DownIcon : public ClickableLabel
 {
 public:
-    explicit DownIcon(QWidget* parent = 0);
+    explicit DownIcon(QWidget* parent = nullptr);
 
 private:
     void contextMenuEvent(QContextMenuEvent* ev) override;

src/lib/navigation/goicon.h

@@ -24,7 +24,7 @@
 class FALKON_EXPORT GoIcon : public ClickableLabel
 {
 public:
-    explicit GoIcon(QWidget* parent = 0);
+    explicit GoIcon(QWidget* parent = nullptr);
 
 private:
     void contextMenuEvent(QContextMenuEvent* ev) override;

src/lib/navigation/navigationcontainer.h

@@ -29,7 +29,7 @@ class TabBar;
 class FALKON_EXPORT NavigationContainer : public QWidget
 {
 public:
-    explicit NavigationContainer(QWidget* parent = 0);
+    explicit NavigationContainer(QWidget* parent = nullptr);
 
     void addWidget(QWidget* widget);
     void setTabBar(TabBar* tabBar);

src/lib/navigation/reloadstopbutton.h

@@ -28,7 +28,7 @@ class FALKON_EXPORT ReloadStopButton : public ToolButton
     Q_OBJECT
 
 public:
-    explicit ReloadStopButton(QWidget* parent = 0);
+    explicit ReloadStopButton(QWidget* parent = nullptr);
 
     void showStopButton();
     void showReloadButton();

src/lib/navigation/websearchbar.h

@@ -38,7 +38,7 @@ class OpenSearchEngine;
 class FALKON_EXPORT WebSearchBar_Button : public ClickableLabel
 {
 public:
-    explicit WebSearchBar_Button(QWidget* parent = 0);
+    explicit WebSearchBar_Button(QWidget* parent = nullptr);
 
 private:
     void contextMenuEvent(QContextMenuEvent* event) override;

src/lib/network/sslerrordialog.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT SslErrorDialog : public QDialog
 public:
     enum Result { Yes, No, OnlyForThisSession, NoForThisSession };
 
-    explicit SslErrorDialog(QWidget* parent = 0);
+    explicit SslErrorDialog(QWidget* parent = nullptr);
     ~SslErrorDialog();
 
     void setText(const QString &text);

src/lib/opensearch/editsearchengine.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT EditSearchEngine : public QDialog
 {
     Q_OBJECT
 public:
-    explicit EditSearchEngine(const QString &title, QWidget* parent = 0);
+    explicit EditSearchEngine(const QString &title, QWidget* parent = nullptr);
 
     void setName(const QString &name);
     void setUrl(const QString &url);

src/lib/opensearch/searchenginesdialog.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT SearchEnginesDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit SearchEnginesDialog(QWidget* parent = 0);
+    explicit SearchEnginesDialog(QWidget* parent = nullptr);
     ~SearchEnginesDialog();
 
 public Q_SLOTS:

src/lib/other/aboutdialog.h

@@ -32,7 +32,7 @@ class FALKON_EXPORT AboutDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit AboutDialog(QWidget* parent = 0);
+    explicit AboutDialog(QWidget* parent = nullptr);
     ~AboutDialog();
 
 private Q_SLOTS:

src/lib/other/browsinglibrary.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT BrowsingLibrary : public QWidget
     Q_OBJECT
 
 public:
-    explicit BrowsingLibrary(BrowserWindow* window, QWidget* parent = 0);
+    explicit BrowsingLibrary(BrowserWindow* window, QWidget* parent = nullptr);
     ~BrowsingLibrary();
 
     void showHistory(BrowserWindow* window);

src/lib/other/checkboxdialog.h

@@ -27,7 +27,7 @@ class FALKON_EXPORT CheckBoxDialog : public QMessageBox
 {
     Q_OBJECT
 public:
-    explicit CheckBoxDialog(const QMessageBox::StandardButtons &buttons, QWidget* parent = 0);
+    explicit CheckBoxDialog(const QMessageBox::StandardButtons &buttons, QWidget* parent = nullptr);
 
     void setCheckBoxText(const QString &text);
 

src/lib/other/clearprivatedata.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT ClearPrivateData : public QDialog
 {
     Q_OBJECT
 public:
-    explicit ClearPrivateData(QWidget* parent = 0);
+    explicit ClearPrivateData(QWidget* parent = nullptr);
 
     static void clearLocalStorage();
     static void clearWebDatabases();

src/lib/other/iconchooser.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT IconChooser : public QDialog
     Q_OBJECT
 
 public:
-    explicit IconChooser(QWidget* parent = 0);
+    explicit IconChooser(QWidget* parent = nullptr);
     ~IconChooser();
 
     QIcon getIcon();
@@ -51,7 +51,7 @@ private:
 class FALKON_EXPORT IconChooserDelegate : public QStyledItemDelegate
 {
 public:
-    explicit IconChooserDelegate(QWidget* parent = 0);
+    explicit IconChooserDelegate(QWidget* parent = nullptr);
 
     void paint(QPainter* painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;

src/lib/other/licenseviewer.h

@@ -29,7 +29,7 @@ class FALKON_EXPORT LicenseViewer : public QWidget
     Q_OBJECT
 
 public:
-    explicit LicenseViewer(QWidget* parent = 0);
+    explicit LicenseViewer(QWidget* parent = nullptr);
 
     void setLicenseFile(const QString &fileName);
     void setText(const QString &text);

src/lib/other/siteinfowidget.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT SiteInfoWidget : public LocationBarPopup
 {
     Q_OBJECT
 public:
-    explicit SiteInfoWidget(BrowserWindow* window, QWidget* parent = 0);
+    explicit SiteInfoWidget(BrowserWindow* window, QWidget* parent = nullptr);
     ~SiteInfoWidget();
 
 private:

src/lib/popupwindow/popuplocationbar.cpp

@@ -27,7 +27,7 @@
 class FALKON_EXPORT PopupSiteIcon : public QWidget
 {
 public:
-    explicit PopupSiteIcon(QWidget* parent = 0) : QWidget(parent) { }
+    explicit PopupSiteIcon(QWidget* parent = nullptr) : QWidget(parent) { }
     void setIcon(const QIcon &icon) {
         m_icon = QIcon(icon.pixmap(16));
         update();

src/lib/popupwindow/popuplocationbar.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT PopupLocationBar : public LineEdit
     Q_PROPERTY(int fixedheight READ height WRITE setFixedHeight)
 
 public:
-    explicit PopupLocationBar(QWidget* parent = 0);
+    explicit PopupLocationBar(QWidget* parent = nullptr);
 
     void setView(PopupWebView* view);
 

src/lib/popupwindow/popupwebview.h

@@ -31,7 +31,7 @@ class FALKON_EXPORT PopupWebView : public WebView
 {
     Q_OBJECT
 public:
-    explicit PopupWebView(QWidget* parent = 0);
+    explicit PopupWebView(QWidget* parent = nullptr);
 
     QWidget* overlayWidget() override;
     void loadInNewTab(const LoadRequest &req, Qz::NewTabPositionFlags position) override;

src/lib/preferences/acceptlanguage.h

@@ -33,7 +33,7 @@ class FALKON_EXPORT AcceptLanguage : public QDialog
     Q_OBJECT
 
 public:
-    explicit AcceptLanguage(QWidget* parent = 0);
+    explicit AcceptLanguage(QWidget* parent = nullptr);
     ~AcceptLanguage();
 
     static QStringList defaultLanguage();

src/lib/preferences/autofillmanager.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT AutoFillManager : public QWidget
     Q_OBJECT
 
 public:
-    explicit AutoFillManager(QWidget* parent = 0);
+    explicit AutoFillManager(QWidget* parent = nullptr);
     ~AutoFillManager();
 
     void showExceptions();

src/lib/preferences/jsoptions.h

@@ -33,7 +33,7 @@ class FALKON_EXPORT JsOptions : public QDialog
     Q_OBJECT
 
 public:
-    explicit JsOptions(QWidget* parent = 0);
+    explicit JsOptions(QWidget* parent = nullptr);
     ~JsOptions();
 
 public Q_SLOTS:

src/lib/preferences/pluginsmanager.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT PluginsManager : public QWidget
     Q_OBJECT
 
 public:
-    explicit PluginsManager(QWidget* parent = 0);
+    explicit PluginsManager(QWidget* parent = nullptr);
     ~PluginsManager();
 
     void load();

src/lib/preferences/useragentdialog.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT UserAgentDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit UserAgentDialog(QWidget* parent = 0);
+    explicit UserAgentDialog(QWidget* parent = nullptr);
     ~UserAgentDialog();
 
 private Q_SLOTS:

src/lib/sidebar/bookmarkssidebar.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT BookmarksSidebar : public QWidget
     Q_OBJECT
 
 public:
-    explicit BookmarksSidebar(BrowserWindow* window, QWidget* parent = 0);
+    explicit BookmarksSidebar(BrowserWindow* window, QWidget* parent = nullptr);
     ~BookmarksSidebar();
 
 private Q_SLOTS:

src/lib/sidebar/historysidebar.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT HistorySideBar : public QWidget
     Q_OBJECT
 
 public:
-    explicit HistorySideBar(BrowserWindow* window, QWidget* parent = 0);
+    explicit HistorySideBar(BrowserWindow* window, QWidget* parent = nullptr);
     ~HistorySideBar();
 
 private Q_SLOTS:

src/lib/tabwidget/combotabbar.h

@@ -57,7 +57,7 @@ public:
         AfterTab
     };
 
-    explicit ComboTabBar(QWidget* parent = 0);
+    explicit ComboTabBar(QWidget* parent = nullptr);
 
     int addTab(const QString &text);
     int addTab(const QIcon &icon, const QString &text);
@@ -296,7 +296,7 @@ class FALKON_EXPORT TabScrollBar : public QScrollBar
 {
     Q_OBJECT
 public:
-    explicit TabScrollBar(QWidget* parent = 0);
+    explicit TabScrollBar(QWidget* parent = nullptr);
     ~TabScrollBar();
 
     bool isScrolling() const;
@@ -312,7 +312,7 @@ class FALKON_EXPORT TabBarScrollWidget : public QWidget
 {
     Q_OBJECT
 public:
-    explicit TabBarScrollWidget(QTabBar* tabBar, QWidget* parent = 0);
+    explicit TabBarScrollWidget(QTabBar* tabBar, QWidget* parent = nullptr);
 
     QTabBar* tabBar();
     QScrollArea* scrollArea();

src/lib/tabwidget/tabicon.h

@@ -39,7 +39,7 @@ public:
         QPixmap audioPlayingPixmap;
         QPixmap audioMutedPixmap;
     };
-    explicit TabIcon(QWidget* parent = 0);
+    explicit TabIcon(QWidget* parent = nullptr);
 
     void setWebTab(WebTab* tab);
     void updateIcon();

src/lib/tabwidget/tabstackedwidget.h

@@ -33,7 +33,7 @@ class FALKON_EXPORT TabStackedWidget : public QWidget
 {
     Q_OBJECT
 public:
-    explicit TabStackedWidget(QWidget* parent = 0);
+    explicit TabStackedWidget(QWidget* parent = nullptr);
     ~TabStackedWidget();
 
     ComboTabBar* tabBar();

src/lib/tabwidget/tabwidget.h

@@ -53,7 +53,7 @@ class FALKON_EXPORT MenuTabs : public QMenu
 {
     Q_OBJECT
 public:
-    explicit MenuTabs(QWidget* parent = 0) : QMenu(parent) {}
+    explicit MenuTabs(QWidget* parent = nullptr) : QMenu(parent) {}
 
 Q_SIGNALS:
     void closeTab(int);

src/lib/tools/animatedwidget.h

@@ -30,7 +30,7 @@ class FALKON_EXPORT AnimatedWidget : public QWidget
 public:
     enum Direction { Down, Up };
 
-    explicit AnimatedWidget(const Direction &direction = Down, int duration = 300, QWidget* parent = 0);
+    explicit AnimatedWidget(const Direction &direction = Down, int duration = 300, QWidget* parent = nullptr);
 
     QWidget* widget() { return m_widget; }
 

src/lib/tools/buttonwithmenu.h

@@ -53,7 +53,7 @@ public:
         }
     };
 
-    explicit ButtonWithMenu(QWidget* parent = 0);
+    explicit ButtonWithMenu(QWidget* parent = nullptr);
     ~ButtonWithMenu();
 
     void addItem(const Item &item);

src/lib/tools/certificateinfowidget.h

@@ -32,7 +32,7 @@ class QSslCertificate;
 class FALKON_EXPORT CertificateInfoWidget : public QWidget
 {
 public:
-    explicit CertificateInfoWidget(const QSslCertificate &cert, QWidget* parent = 0);
+    explicit CertificateInfoWidget(const QSslCertificate &cert, QWidget* parent = nullptr);
     ~CertificateInfoWidget();
 
     // Qt5 compatibility

src/lib/tools/clickablelabel.h

@@ -35,7 +35,7 @@ class FALKON_EXPORT ClickableLabel : public QLabel
     Q_PROPERTY(QIcon fallbackIcon READ fallbackIcon WRITE setFallbackIcon)
 
 public:
-    explicit ClickableLabel(QWidget* parent = 0);
+    explicit ClickableLabel(QWidget* parent = nullptr);
 
     QString themeIcon() const;
     void setThemeIcon(const QString &name);

src/lib/tools/docktitlebarwidget.h

@@ -26,7 +26,7 @@
 class FALKON_EXPORT DockTitleBarWidget : public QWidget, public Ui_DockTitleBarWidget
 {
 public:
-    explicit DockTitleBarWidget(const QString &title, QWidget* parent = 0);
+    explicit DockTitleBarWidget(const QString &title, QWidget* parent = nullptr);
     ~DockTitleBarWidget();
 
     void setTitle(const QString &title);

src/lib/tools/enhancedmenu.h

@@ -29,8 +29,8 @@ class FALKON_EXPORT Menu : public QMenu
 {
     Q_OBJECT
 public:
-    explicit Menu(QWidget* parent = 0);
+    explicit Menu(QWidget* parent = nullptr);
-    explicit Menu(const QString &title, QWidget* parent = 0);
+    explicit Menu(const QString &title, QWidget* parent = nullptr);
 
     // Default is false, menu will NOT be closed on middle click
     bool closeOnMiddleClick() const;

src/lib/tools/focusselectlineedit.h

@@ -26,7 +26,7 @@ class FALKON_EXPORT FocusSelectLineEdit : public QLineEdit
 {
     Q_OBJECT
 public:
-    explicit FocusSelectLineEdit(QWidget* parent = 0);
+    explicit FocusSelectLineEdit(QWidget* parent = nullptr);
 
 public Q_SLOTS:
     void setFocus();

src/lib/tools/horizontallistwidget.h

@@ -23,7 +23,7 @@
 class HorizontalListWidget : public QListWidget
 {
 public:
-    explicit HorizontalListWidget(QWidget* parent = 0);
+    explicit HorizontalListWidget(QWidget* parent = nullptr);
 
 private:
     void mousePressEvent(QMouseEvent* event) override;

src/lib/tools/html5permissions/html5permissionsdialog.h

@@ -32,7 +32,7 @@ class HTML5PermissionsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit HTML5PermissionsDialog(QWidget* parent = 0);
+    explicit HTML5PermissionsDialog(QWidget* parent = nullptr);
     ~HTML5PermissionsDialog();
 
     void showFeaturePermissions(QWebEnginePage::Feature feature);

src/lib/tools/mactoolbutton.h

@@ -30,7 +30,7 @@ class FALKON_EXPORT MacToolButton : public QPushButton
     Q_PROPERTY(bool autoRaise READ autoRaise WRITE setAutoRaise)
 
 public:
-    explicit MacToolButton(QWidget* parent = 0);
+    explicit MacToolButton(QWidget* parent = nullptr);
 
     void setIconSize(const QSize &size);
 
@@ -49,7 +49,7 @@ class FALKON_EXPORT MacToolButton : public QToolButton
     Q_OBJECT
 
 public:
-    explicit MacToolButton(QWidget* parent = 0);
+    explicit MacToolButton(QWidget* parent = nullptr);
 };
 #endif
 #endif // MACTOOLBUTTON_H

src/lib/tools/progressbar.h

@@ -28,7 +28,7 @@ class FALKON_EXPORT ProgressBar : public QWidget
 {
     Q_OBJECT
 public:
-    explicit ProgressBar(QWidget* parent = 0);
+    explicit ProgressBar(QWidget* parent = nullptr);
 
 public Q_SLOTS:
     void setValue(int value);

src/lib/tools/toolbutton.h

@@ -36,7 +36,7 @@ class FALKON_EXPORT ToolButton : public QToolButton
     Q_PROPERTY(QIcon fallbackIcon READ fallbackIcon WRITE setFallbackIcon)
 
 public:
-    explicit ToolButton(QWidget* parent = 0);
+    explicit ToolButton(QWidget* parent = nullptr);
 
     // MultiIcon - Image containing pixmaps for all button states
     QImage multiIcon() const;

src/lib/tools/treewidget.h

@@ -26,7 +26,7 @@ class FALKON_EXPORT TreeWidget : public QTreeWidget
 {
     Q_OBJECT
 public:
-    explicit TreeWidget(QWidget* parent = 0);
+    explicit TreeWidget(QWidget* parent = nullptr);
     enum ItemShowMode { ItemsCollapsed = 0, ItemsExpanded = 1 };
     ItemShowMode defaultItemShowMode() { return m_showMode; }
     void setDefaultItemShowMode(ItemShowMode mode) { m_showMode = mode; }

src/lib/webengine/webview.h

@@ -34,7 +34,7 @@ class FALKON_EXPORT WebView : public QWebEngineView
     Q_OBJECT
 
 public:
-    explicit WebView(QWidget* parent = 0);
+    explicit WebView(QWidget* parent = nullptr);
     ~WebView();
 
     QIcon icon(bool allowNull = false) const;

src/lib/webtab/searchtoolbar.h

@@ -39,7 +39,7 @@ class FALKON_EXPORT SearchToolBar : public QWidget
 {
     Q_OBJECT
 public:
-    explicit SearchToolBar(WebView* view, QWidget* parent = 0);
+    explicit SearchToolBar(WebView* view, QWidget* parent = nullptr);
     ~SearchToolBar();
 
     void showMinimalInPopupWindow();