maint: style check C++ files in src/ and libgui/ ahead of 7.1 release. * ButtonGroup.cc, Canvas.cc, CheckBoxControl.cc, Container.cc, ContextMenu.cc, EditControl.cc, Figure.cc, Figure.h, FigureWindow.cc, GenericEventNotify.h, ListBoxControl.cc, ListBoxControl.h, Logger.cc, Menu.cc, Object.cc, Panel.cc, PopupMenuControl.cc, PushButtonControl.cc, PushTool.cc, RadioButtonControl.cc, SliderControl.cc, Table.cc, Table.h, TextControl.cc, ToggleButtonControl.cc, ToggleTool.cc, ToolBar.cc, annotation-dialog.cc, qt-graphics-toolkit.cc, documentation-bookmarks.cc, documentation-bookmarks.h, documentation-dock-widget.h, documentation.cc, documentation.h, dw-main-window.h, files-dock-widget.cc, files-dock-widget.h, find-files-dialog.cc, find-files-model.cc, gui-preferences-dw.h, gui-preferences-ed.h, gui-preferences-global.h, gui-settings.h, interpreter-qobject.cc, led-indicator.cc, file-editor-interface.h, file-editor-tab.cc, file-editor-tab.h, file-editor.cc, file-editor.h, find-dialog.cc, find-dialog.h, marker.cc, octave-qscintilla.cc, octave-qscintilla.h, main-window.cc, main-window.h, octave-dock-widget.cc, octave-dock-widget.h, octave-qobject.cc, octave-qobject.h, octave-qtutils.h, qt-interpreter-events.cc, release-notes.cc, resource-manager.cc, set-path-dialog.cc, settings-dialog.cc, settings-dialog.h, shortcut-manager.cc, shortcut-manager.h, tab-bar.cc, tab-bar.h, variable-editor-model.cc, variable-editor-model.h, variable-editor.cc, variable-editor.h, workspace-model.cc, workspace-view.cc, mkoctfile.in.cc, octave-config.in.cc: Style check C++ files in src/ and libgui/ ahead of 7.1 release.

--- a/libgui/src/documentation.h	Mon Nov 29 12:36:04 2021 -0500
+++ b/libgui/src/documentation.h	Mon Nov 29 15:58:51 2021 -0800
@@ -56,7 +56,7 @@
     documentation_browser (QHelpEngine *help_engine, QWidget *parent = nullptr);
     ~documentation_browser (void) = default;
 
-    virtual QVariant loadResource (int type, const QUrl &url);
+    virtual QVariant loadResource (int type, const QUrl& url);
 
   public slots:
 
@@ -130,9 +130,9 @@
     void selectAll (void);
 
     void load_index (void);
-    void load_ref (const QString & name = QString ());
-    void registerDoc (const QString & name);
-    void unregisterDoc (const QString & name);
+    void load_ref (const QString& name = QString ());
+    void registerDoc (const QString& name);
+    void unregisterDoc (const QString& name);
 
   private slots:
 
@@ -155,9 +155,9 @@
   private:
 
     void construct_tool_bar (void);
-    QAction *add_action (const QIcon& icon, const QString& text,
-                         const char *member, QWidget *receiver = nullptr,
-                         QToolBar *tool_bar = nullptr);
+    QAction * add_action (const QIcon& icon, const QString& text,
+                          const char *member, QWidget *receiver = nullptr,
+                          QToolBar *tool_bar = nullptr);
     void update_history (int new_count, QAction **actions);
 
     //! Select all occurrences of a string in the doc browser