Fixed select word on double mouse click such that it works on all platforms.

src/source.cc

@@ -660,7 +660,7 @@ bool Source::View::on_key_press_event(GdkEventKey* key) {
 bool Source::View::on_button_press_event(GdkEventButton *event) {
   if(event->type==GDK_2BUTTON_PRESS) {
     Gtk::TextIter start, end;
-    if(get_buffer()->get_selection_bounds(start, end)) {
+    get_buffer()->get_selection_bounds(start, end);
     auto iter=start;
     while((*iter>=48 && *iter<=57) || (*iter>=65 && *iter<=90) || (*iter>=97 && *iter<=122) || *iter==95) {
       start=iter;
@@ -674,7 +674,6 @@ bool Source::View::on_button_press_event(GdkEventButton *event) {
     get_buffer()->select_range(start, end);
     return true;
   }
-  }
   
   return Gsv::View::on_button_press_event(event);
 }