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/libinterp/corefcn/graphics.in.h	Tue Apr 03 21:48:53 2018 +0200
+++ b/libinterp/corefcn/graphics.in.h	Tue Apr 03 13:52:07 2018 -0700
@@ -1238,22 +1238,22 @@
                  get_name ().c_str (), maxval.first);
       }
 
-      if (finite_constraint == NO_CHECK) { /* do nothing */ }
-      else if (finite_constraint == FINITE)
-        {
-          if (! octave::math::isfinite (new_val))
-            error (R"(set: "%s" must be finite)", get_name ().c_str ());
-        }
-      else if (finite_constraint == NOT_NAN)
-        {
-          if (octave::math::isnan (new_val))
-            error (R"(set: "%s" must not be nan)", get_name ().c_str ());
-        }
-      else if (finite_constraint == NOT_INF)
-        {
-          if (octave::math::isinf (new_val))
-            error (R"(set: "%s" must not be infinite)", get_name ().c_str ());
-        }
+    if (finite_constraint == NO_CHECK) { /* do nothing */ }
+    else if (finite_constraint == FINITE)
+      {
+        if (! octave::math::isfinite (new_val))
+          error (R"(set: "%s" must be finite)", get_name ().c_str ());
+      }
+    else if (finite_constraint == NOT_NAN)
+      {
+        if (octave::math::isnan (new_val))
+          error (R"(set: "%s" must not be nan)", get_name ().c_str ());
+      }
+    else if (finite_constraint == NOT_INF)
+      {
+        if (octave::math::isinf (new_val))
+          error (R"(set: "%s" must not be infinite)", get_name ().c_str ());
+      }
 
     if (new_val != current_val)
       {
@@ -2381,7 +2381,7 @@
     graphics_handle __myhandle__ fhrs , mh
   END_PROPERTIES
 
-    virtual void update_handlevisibility (void);
+  virtual void update_handlevisibility (void);
 
 protected:
   struct cmp_caseless_str
@@ -4329,10 +4329,10 @@
 
   protected:
     void init (void)
-      {
-        linewidth.add_constraint ("min", 0, false);
-        markersize.add_constraint ("min", 0, false);
-      }
+    {
+      linewidth.add_constraint ("min", 0, false);
+      markersize.add_constraint ("min", 0, false);
+    }
 
   private:
     Matrix compute_xlim (void) const;