eliminate global access to Octave interpreter in qt graphics classes Provide reference to interprerter to qt graphics classes to eliminate need for accessing it through a global variable. * qt-graphics-toolkit.cc (qt_graphics_toolkit::create_object): Pass m_interpreter to create functions for individual graphics objects. * BaseControl.h, BaseControl.cc, ButtonControl.h, ButtonControl.cc, ButtonGroup.h, ButtonGroup.cc, Canvas.h, Canvas.cc, CheckBoxControl.h, CheckBoxControl.cc, Container.h, Container.cc, ContextMenu.h, ContextMenu.cc, EditControl.h, EditControl.cc, Figure.h, Figure.cc, GLCanvas.h, GLCanvas.cc, ListBoxControl.h, ListBoxControl.cc, Menu.h, Menu.cc, Object.h, Object.cc, Panel.h, Panel.cc, PopupMenuControl.h, PopupMenuControl.cc, PushButtonControl.h, PushButtonControl.cc, PushTool.h, PushTool.cc, QtHandlesUtils.h, RadioButtonControl.h, RadioButtonControl.cc, SliderControl.h, SliderControl.cc, Table.h, Table.cc, TextControl.h, TextControl.cc, ToggleButtonControl.h, ToggleButtonControl.cc, ToggleTool.h, ToggleTool.cc, ToolBar.h, ToolBar.cc, ToolBarButton.h, ToolBarButton.cc: Accept reference to interpreter in create function and constructors for graphics objects. Eliminate global access to interpreter object and graphics_handle manager.

--- a/libgui/graphics/Container.h	Tue Nov 05 18:23:20 2019 -0500
+++ b/libgui/graphics/Container.h	Wed Nov 06 12:42:12 2019 -0500
@@ -47,7 +47,8 @@
     Q_OBJECT
 
   public:
-    Container (QWidget *parent, octave::base_qobject& oct_qobj);
+    Container (QWidget *parent, octave::base_qobject& oct_qobj,
+               octave::interpreter& interp);
     ~Container (void);
 
     Canvas * canvas (const graphics_handle& handle, bool create = true);
@@ -78,6 +79,7 @@
 
   private:
     octave::base_qobject& m_octave_qobj;
+    octave::interpreter& m_interpreter;
     Canvas *m_canvas;
   };