--- a/libgui/src/m-editor/file-editor-tab.cc	Tue Dec 06 15:17:16 2022 -0500
+++ b/libgui/src/m-editor/file-editor-tab.cc	Tue Dec 06 15:37:43 2022 -0500
@@ -96,8 +96,8 @@
 #include "utils.h"
 #include "version.h"
 
-namespace octave
-{
+OCTAVE_BEGIN_NAMESPACE(octave)
+
   //! A file_editor_tab object consists of a text area and three left margins.
   //! The first holds breakpoints, bookmarks, and the debug program counter.
   //! The second holds line numbers.  The third holds "fold" marks, to hide
@@ -597,7 +597,6 @@
       }
   }
 
-
   void file_editor_tab::update_lexer (void)
   {
     // Create a new lexer
@@ -703,7 +702,6 @@
       }
   }
 
-
   // Update settings, which are lexer related and have to be updated
   // when
   //    a) the lexer changes,
@@ -841,7 +839,6 @@
                            api_entries.append (QString::fromStdString (bfl[i]));
                        }
 
-
                      if (octave_functions)
                        {
                          load_path& lp = interp.get_load_path ();
@@ -1140,7 +1137,6 @@
     m_edit_area->setCursorPosition (prevline, 0);
   }
 
-
   QString file_editor_tab::get_all_bookmarks ()
   {
     QString bmlist;
@@ -2859,7 +2855,6 @@
 
   }
 
-
   void file_editor_tab::auto_margin_width (void)
   {
     m_edit_area->setMarginWidth (2, "1" + QString::number (m_edit_area->lines ()));
@@ -3296,6 +3291,7 @@
 
     return QString ();
   }
-}
+
+OCTAVE_END_NAMESPACE(octave)
 
 #endif