retain selection when scrolling

Fixed overwriting the text when scrolling while in the middle of a
selection

gframe/event_handler.cpp

@@ -720,8 +720,16 @@ bool ClientField::OnEvent(const irr::SEvent& event) {
 					else
 						mainGame->btnCardSelect[i]->setImage(imageManager.tCover);
 					mainGame->btnCardSelect[i]->setRelativePosition(rect<s32>(30 + i * 125, 55, 30 + 120 + i * 125, 225));
-					myswprintf(formatBuffer, L"%ls[%d]", dataManager.FormatLocation(selectable_cards[i + pos]->location),
-					           selectable_cards[i + pos]->sequence + 1);
+					if (sort_list.size()){
+						if (sort_list[pos + i]> 0)
+							myswprintf(formatBuffer, L"%d", sort_list[pos + i]);
+						else
+							myswprintf(formatBuffer, L"");
+					}
+					else{
+						myswprintf(formatBuffer, L"%ls[%d]", dataManager.FormatLocation(selectable_cards[i + pos]->location),
+							selectable_cards[i + pos]->sequence + 1);
+					}
 					mainGame->stCardPos[i]->setText(formatBuffer);
 					if(selectable_cards[i + pos]->is_selected)
 						mainGame->stCardPos[i]->setBackgroundColor(0xffffff00);