maint: style check C++ ahead of 4.4 release. * ButtonGroup.cc, Canvas.cc, Figure.cc, GLCanvas.cc, GLCanvas.h, ListBoxControl.cc, ObjectProxy.cc, QTerminal.h, dialog.cc, documentation.cc, files-dock-widget.cc, history-dock-widget.cc, file-editor-tab.cc, file-editor.h, find-dialog.cc, marker.h, octave-qscintilla.cc, octave-qscintilla.h, main-window.cc, webinfo.cc, resource-manager.h, settings-dialog.cc, shortcut-manager.cc, shortcut-manager.h, variable-editor.cc, workspace-view.cc, build-env.in.cc, __ilu__.cc, cellfun.cc, data.cc, dirfns.cc, dynamic-ld.h, environment.cc, error.cc, fcn-info.cc, gl-render.cc, gl2ps-print.cc, graphics.cc, graphics.in.h, help.cc, interpreter.cc, load-path.cc, load-save.cc, ls-mat5.cc, mex.cc, oct-stream.cc, oct-stream.h, qz.cc, sighandlers.cc, sparse-xpow.cc, svd.cc, symscope.h, symtab.cc, symtab.h, sysdep.cc, url-handle-manager.h, utils.cc, variables.cc, __init_fltk__.cc, __ode15__.cc, gzip.cc, ov-base.cc, ov-builtin.h, ov-cell.cc, ov-class.cc, ov-dld-fcn.h, ov-fcn-handle.cc, ov-java.cc, ov-re-diag.cc, op-b-sbm.cc, op-bm-b.cc, op-bm-bm.cc, op-bm-sbm.cc, op-cdm-cdm.cc, op-cell.cc, op-cm-cm.cc, op-cm-cs.cc, op-cm-m.cc, op-cm-s.cc, op-cm-scm.cc, op-cm-sm.cc, op-cs-cm.cc, op-cs-cs.cc, op-cs-m.cc, op-cs-s.cc, op-cs-scm.cc, op-cs-sm.cc, op-dm-dm.cc, op-dm-scm.cc, op-dm-sm.cc, op-fcdm-fcdm.cc, op-fcm-fcm.cc, op-fcm-fcs.cc, op-fcm-fm.cc, op-fcm-fs.cc, op-fcs-fcm.cc, op-fcs-fcs.cc, op-fcs-fm.cc, op-fcs-fs.cc, op-fdm-fdm.cc, op-fm-fcm.cc, op-fm-fcs.cc, op-fm-fm.cc, op-fm-fs.cc, op-fs-fcm.cc, op-fs-fcs.cc, op-fs-fm.cc, op-fs-fs.cc, op-m-cm.cc, op-m-cs.cc, op-m-m.cc, op-m-s.cc, op-m-scm.cc, op-m-sm.cc, op-pm-pm.cc, op-pm-scm.cc, op-pm-sm.cc, op-range.cc, op-s-cm.cc, op-s-cs.cc, op-s-m.cc, op-s-s.cc, op-s-scm.cc, op-s-sm.cc, op-sbm-b.cc, op-sbm-bm.cc, op-sbm-sbm.cc, op-scm-cm.cc, op-scm-cs.cc, op-scm-m.cc, op-scm-s.cc, op-scm-scm.cc, op-scm-sm.cc, op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc, op-sm-s.cc, op-sm-scm.cc, op-sm-sm.cc, op-str-m.cc, op-str-s.cc, op-str-str.cc, bp-table.cc, comment-list.h, jit-ir.h, jit-typeinfo.cc, jit-typeinfo.h, lex.h, parse.h, pt-binop.h, pt-decl.h, pt-eval.cc, pt-jit.cc, pt-jit.h, pt-misc.h, token.h, CMatrix.cc, CMatrix.h, CSparse.cc, CSparse.h, dMatrix.h, fCMatrix.cc, fCMatrix.h, fMatrix.h, Faddeeva.cc, gepbalance.cc, hess.cc, oct-fftw.cc, oct-fftw.h, file-stat.cc, lo-sysinfo.cc, action-container.h, f77-fcn.h, lo-regexp.cc, oct-mutex.h, oct-shlib.cc: Use Octave coding conventions in C++ files.

--- a/libgui/graphics/GLCanvas.cc	Tue Apr 03 21:48:53 2018 +0200
+++ b/libgui/graphics/GLCanvas.cc	Tue Apr 03 13:52:07 2018 -0700
@@ -78,7 +78,7 @@
   {
     uint8NDArray retval;
     graphics_object go = gh_manager::get_object (gh);
-    
+
     if (go && go.isa ("figure"))
       {
         Matrix pos = go.get ("position").matrix_value ();
@@ -94,15 +94,15 @@
             || go.get ("__printing__").string_value () == "on")
           {
             OCTAVE_QT_OPENGL_FBO
-              fbo (pos(2), pos(3),OCTAVE_QT_OPENGL_FBO::Attachment::Depth);
-            
+            fbo (pos(2), pos(3),OCTAVE_QT_OPENGL_FBO::Attachment::Depth);
+
             fbo.bind ();
-            
+
             octave::opengl_renderer r;
             r.set_viewport (pos(2), pos(3));
             r.draw (go);
             retval = r.get_pixels (pos(2), pos(3));
-            
+
             fbo.release ();
           }
         else
@@ -110,7 +110,7 @@
             octave::opengl_renderer r;
             r.set_viewport (pos(2), pos(3));
             r.draw (go);
-            retval = r.get_pixels (pos(2), pos(3));            
+            retval = r.get_pixels (pos(2), pos(3));
           }
 
         end_rendering ();
@@ -118,7 +118,7 @@
 
     return retval;
   }
-  
+
   void
   GLCanvas::do_print (const QString& file_cmd, const QString& term,
                       const graphics_handle& handle)
@@ -134,7 +134,7 @@
             // Make sure we have a valid current context
             if (! begin_rendering ())
               error ("print: no valid OpenGL offscreen context");
-            
+
             octave::gl2ps_print (figObj, file_cmd.toStdString (),
                                  term.toStdString ());
           }
@@ -280,7 +280,7 @@
   GLCanvas::begin_rendering (void)
   {
     bool retval = true;
-    
+
     if (! isValid ())
       {
 #  if defined (HAVE_QT_OFFSCREEN)
@@ -295,21 +295,21 @@
                 return false;
               }
           }
-       
+
         retval = m_os_context.makeCurrent (&m_os_surface);
-#  else   
+#  else
         retval = false;
 #  endif
       }
     else
       makeCurrent ();
-    
+
     return retval;
   }
-  
+
   void
   GLCanvas::end_rendering (void)
-  {        
+  {
     doneCurrent ();
   }
 }