make copying figures to clipboard work (bug #44866) * Figure.cc (Figure::copy_figure_callback): Just print the figure to a file here, then call octave_link::copy_image_to_clipboard. (delete_file): Delete unused static function. * main-window.h, main-window.cc (main_window::copy_image_to_clipboard): New function. (main_window::construct_octave_qt_link): Connect octave_qt_link::copy_image_to_clipboard_signal signal to main_window::copy_image_to_clipboard slot. * octave-qt-link.h, octave-qt-link.cc (octave_qt_link::do_copy_image_to_clipboard): New function. (octave_qt_link::copy_image_to_clipboard_signal): New signal. * octave-link.h (octave_link::do_copy_image_to_clipboard): New pure virtual function. (octave_link::copy_image_to_clipboard): New static funtion.

--- a/libgui/src/octave-qt-link.cc	Tue Apr 21 15:01:55 2015 +0100
+++ b/libgui/src/octave-qt-link.cc	Wed Apr 22 00:36:24 2015 -0500
@@ -99,6 +99,14 @@
 }
 
 bool
+octave_qt_link::do_copy_image_to_clipboard (const std::string& file)
+{
+  emit copy_image_to_clipboard_signal (QString::fromStdString (file), true);
+
+  return true;
+}
+
+bool
 octave_qt_link::do_edit_file (const std::string& file)
 {
   emit edit_file_signal (QString::fromStdString (file));