Added workaround for MacOS crash that sometimes happen when using drag-and-drop on text in a Gtk::TextView widget

src/source.cc

@@ -2486,6 +2486,25 @@ bool Source::View::on_button_press_event(GdkEventButton *event) {
   return Gsv::View::on_button_press_event(event);
 }
 
+bool Source::View::on_motion_notify_event(GdkEventMotion *event) {
+  // Workaround for drag-and-drop crash on MacOS
+  // TODO 2018: check if this bug has been fixed
+#ifdef __APPLE__
+  if((event->state & GDK_BUTTON1_MASK) == 0)
+    return Gsv::View::on_motion_notify_event(event);
+  else {
+    int x, y;
+    window_to_buffer_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, event->x, event->y, x, y);
+    Gtk::TextIter iter;
+    get_iter_at_location(iter, x, y);
+    get_buffer()->select_range(get_buffer()->get_insert()->get_iter(), iter);
+    return true;
+  }
+#else
+  return Gsv::View::on_motion_notify_event(event);
+#endif
+}
+
 std::pair<char, unsigned> Source::View::find_tab_char_and_size() {
   std::unordered_map<char, size_t> tab_chars;
   std::unordered_map<unsigned, size_t> tab_sizes;

src/source.h

@@ -150,6 +150,7 @@ namespace Source {
     bool on_key_press_event_smart_brackets(GdkEventKey* key);
     bool on_key_press_event_smart_inserts(GdkEventKey* key);
     bool on_button_press_event(GdkEventButton *event) override;
+    bool on_motion_notify_event(GdkEventMotion *motion_event) override;
     
     std::pair<char, unsigned> find_tab_char_and_size();
     unsigned tab_size;

src/terminal.cc

@@ -164,16 +164,34 @@ void Terminal::kill_async_processes(bool force) {
     process->kill(force);
 }
 
-bool Terminal::on_motion_notify_event(GdkEventMotion *motion_event) {
+bool Terminal::on_motion_notify_event(GdkEventMotion *event) {
   Gtk::TextIter iter;
   int location_x, location_y;
-  window_to_buffer_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, motion_event->x, motion_event->y, location_x, location_y);
+  window_to_buffer_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, event->x, event->y, location_x, location_y);
   get_iter_at_location(iter, location_x, location_y);
   if(iter.has_tag(link_tag))
     get_window(Gtk::TextWindowType::TEXT_WINDOW_TEXT)->set_cursor(link_mouse_cursor);
   else
     get_window(Gtk::TextWindowType::TEXT_WINDOW_TEXT)->set_cursor(default_mouse_cursor);
-  return Gtk::TextView::on_motion_notify_event(motion_event);
+  
+  // Workaround for drag-and-drop crash on MacOS
+  // TODO 2018: check if this bug has been fixed
+#ifdef __APPLE__
+  if((event->state & GDK_BUTTON1_MASK) == 0)
+    return Gtk::TextView::on_motion_notify_event(event);
+  else {
+    int x, y;
+    window_to_buffer_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, event->x, event->y, x, y);
+    Gtk::TextIter iter;
+    get_iter_at_location(iter, x, y);
+    get_buffer()->select_range(get_buffer()->get_insert()->get_iter(), iter);
+    return true;
+  }
+#else
+  return Gtk::TextView::on_motion_notify_event(event);
+#endif
+  
+  return Gtk::TextView::on_motion_notify_event(event);
 }
 
 std::tuple<size_t, size_t, std::string, std::string, std::string> Terminal::find_link(const std::string &line) {