Added 'sell all' tooltip to show items you can sell

* Now 'sell all' button with enable/disable
* Fixed display issue with 'sell all' button
* Also changed spinbox button click

modules/game_npctrade/npctrade.lua

@@ -436,6 +436,21 @@ function onPlayerGoods(money, items)
     end
   end
 
+  local first = true
+  local info = ''
+  for key, amount in pairs(playerItems) do
+    if amount > 0 then
+      local data = getTradeItemData(key, SELL)
+      if data then
+        info = info..(not first and "\n" or "")..amount.." "..data.name.." ("..data.price*amount.." gold)"
+        if first then first = false end
+      end
+    end
+  end
+  if info ~= '' then
+    sellAllButton:setTooltip(info)
+  end
+
   refreshPlayerGoods()
 end
 
@@ -453,6 +468,29 @@ function onInventoryChange(inventory, item, oldItem)
   end
 end
 
+function getTradeItemData(id, type)
+  if table.empty(tradeItems[type]) then
+    return false
+  end
+
+  if type then
+    for key,item in pairs(tradeItems[type]) do
+      if item.ptr and item.ptr:getId() == id then
+        return item
+      end
+    end
+  else
+    for _,items in pairs(tradeItems) do
+      for key,item in pairs(items) do
+        if item.ptr and item.ptr:getId() == id then
+          return item
+        end
+      end
+    end
+  end
+  return false
+end
+
 function formatCurrency(amount)
   if CURRENCY_DECIMAL then
     return string.format("%.02f", amount/100.0) .. ' ' .. CURRENCY

modules/game_npctrade/npctrade.otui

@@ -250,6 +250,7 @@ MainWindow
     anchors.right: next.left
     anchors.bottom: parent.bottom
     margin-right: 10
+    visible: false
     @onClick: modules.game_npctrade.sellAll()
 
   Button