try to use consitent ordering for include files in libgui sources Use alphabetical ordering for include files in libgui sources. Group in blocks in teh following order: standard header files Qt header files libgui header files liboctave header files libinterp header files Use forward declarations for Octave classes where possible. Files affected: color-picker.h, dialog.cc, dialog.h, documentation-dock-widget.h, documentation.cc, dw-main-window.cc, dw-main-window.h, external-editor-interface.cc, external-editor-interface.h, files-dock-widget.cc, files-dock-widget.h, find-files-dialog.cc, find-files-dialog.h, find-files-model.h, gui-preferences-mw.h, gui-preferences.h, history-dock-widget.cc, history-dock-widget.h, interpreter-qobject.cc, m-editor/file-editor-interface.h, m-editor/file-editor-tab.cc, m-editor/file-editor-tab.h, m-editor/file-editor.cc, m-editor/file-editor.h, m-editor/marker.h, m-editor/octave-qscintilla.cc, m-editor/octave-qscintilla.h, main-window.cc, main-window.h, octave-dock-widget.cc, octave-dock-widget.h, octave-qobject.cc, qt-application.cc, qt-interpreter-events.cc, qt-interpreter-events.h, resource-manager.cc, resource-manager.h, set-path-dialog.cc, set-path-dialog.h, set-path-model.cc, set-path-model.h, settings-dialog.cc, settings-dialog.h, shortcut-manager.cc, shortcut-manager.h, tab-bar.h, terminal-dock-widget.cc, terminal-dock-widget.h, variable-editor.cc, variable-editor.h, welcome-wizard.cc, welcome-wizard.h, workspace-model.cc, workspace-model.h, workspace-view.cc, and workspace-view.h.

--- a/libgui/src/external-editor-interface.h	Fri Jun 07 10:14:35 2019 +0200
+++ b/libgui/src/external-editor-interface.h	Sun Sep 15 12:28:23 2019 -0400
@@ -24,8 +24,8 @@
 #if ! defined (octave_external_editor_interface_h)
 #define octave_external_editor_interface_h 1
 
+#include <QString>
 #include <QWidget>
-#include <QString>
 
 namespace octave
 {