Moved tab_index to Style (instead of Field), it makes more sense there, since it pertains to the layout of stuff on the card.

Also don't precalculate list of fields sorted by tab order, just find the next/previous ones on the fly.

src/data/field.cpp

@@ -33,7 +33,6 @@ Field::Field()
   , card_list_visible(false)
   , card_list_allow  (true)
   , card_list_align  (ALIGN_LEFT)
-  , tab_index        (0)
 {}
 
 Field::~Field() {}
@@ -64,7 +63,6 @@ IMPLEMENT_REFLECTION(Field) {
   REFLECT(card_list_name);
   REFLECT(sort_script);
   REFLECT_N("card_list_alignment", card_list_align);
-  REFLECT(tab_index);
   REFLECT_IF_READING if(caption.empty()) caption = name_to_caption(name);
   REFLECT_IF_READING if(card_list_name.empty()) card_list_name = capitalize(caption);
 }
@@ -97,6 +95,7 @@ intrusive_ptr<Field> read_new<Field>(Reader& reader) {
 Style::Style(const FieldP& field)
   : fieldP(field)
   , z_index(0)
+  , tab_index(0)
   , left (1000000), top   (1000000)
   , width(0),       height(0)
   , right(1000000), bottom(1000000)
@@ -110,6 +109,7 @@ Style::~Style() {}
 
 IMPLEMENT_REFLECTION(Style) {
   REFLECT(z_index);
+  REFLECT(tab_index);
   REFLECT(left);
   REFLECT(width);
   REFLECT(right);