maint: Update Qt macros to avoid name collisions It is a known problem with Qt that terms like "signals", "slots", and "emit" can conflict with other libraries using those identifiers. So far, Octave has not had that problem, but to allow for potential future use of third-party libraries, especially the C++17 STL's parallelization functions, these terms are being updated to their Qt-specific collision-safe versions. Discussion: https://octave.discourse.group/t/updating-qt-macro-names-to-avoid-name-collisions/5627 and discussions linked therein. This patch makes the following changes through the part of the Octave codebase using Qt: * signals --> Q_SIGNALS * slots --> Q_SLOTS * emit --> Q_EMIT The above changes were guided and verified by passing "-DQT_NO_KEYWORDS" to CXXFLAGS when building Octave.

--- a/libgui/graphics/Object.h	Sat May 18 10:41:40 2024 -0400
+++ b/libgui/graphics/Object.h	Fri May 17 19:49:10 2024 -0400
@@ -86,7 +86,7 @@
   virtual void do_connections (const QObject *receiver,
                                const QObject *emitter = nullptr);
 
-signals:
+Q_SIGNALS:
 
   void interpreter_event (const octave::fcn_callback& fcn);
   void interpreter_event (const octave::meth_callback& meth);
@@ -106,7 +106,7 @@
                      const octave_value& value, bool notify_toolkit,
                      bool redraw_figure);
 
-public slots:
+public Q_SLOTS:
   void slotUpdate (int pId);
   void slotFinalize ();
   void slotRedraw ();