eliminate unnecessary uses of octave:: namespace qualifier Affected files: graphics-init.cc, octave-qscintilla.cc, octave-qobject.h, qt-application.h, workspace-view.cc, call-stack.cc, dynamic-ld.cc, error.cc, error.h, event-manager.h, fcn-info.cc, ft-text-renderer.cc, gl-render.cc, gl2ps-print.cc, graphics-toolkit.cc, input.cc, load-path.cc, oct-hist.cc, oct-stream.cc, pager.cc, stack-frame.cc, symscope.cc, sysdep.cc, __ode15__.cc, cdef-class.cc, ov-fcn-handle.cc, ov.cc, ov.h, oct-parse.yy, pt-classdef.h, pt-eval.cc, Range.cc, Range.h, dir-ops.h, file-stat.cc, lo-sysdep.cc, lo-utils.cc, oct-glob.cc, and url-transfer.cc.

--- a/libinterp/corefcn/ft-text-renderer.cc	Mon Oct 05 13:57:00 2020 -0400
+++ b/libinterp/corefcn/ft-text-renderer.cc	Mon Oct 05 15:19:15 2020 -0400
@@ -980,9 +980,10 @@
 
     m_strlist = std::list<text_renderer::string> ();
 
-    octave::unwind_protect_var<bool> restore_var1 (m_do_strlist);
-    octave::unwind_protect_var<std::list<text_renderer::string>>
+    unwind_protect_var<bool> restore_var1 (m_do_strlist);
+    unwind_protect_var<std::list<text_renderer::string>>
       restore_var2 (m_strlist);
+
     m_do_strlist = true;
 
     text_to_pixels (txt, pxls, box, ha, va, rot, interp, false);