Fix buy/sell of stackable items on 8.6

modules/corelib/ui/uiminiwindowcontainer.lua

@@ -115,8 +115,10 @@ function UIMiniWindowContainer:swapInsert(widget, index)
 
   if oldParent == self and oldIndex ~= index then
     local oldWidget = self:getChildByIndex(index)
-    self:removeChild(oldWidget)
-    self:insertChild(oldIndex, oldWidget)
+    if oldWidget then
+      self:removeChild(oldWidget)
+      self:insertChild(oldIndex, oldWidget)
+    end
     self:removeChild(widget)
     self:insertChild(index, widget)
   end

modules/game_interface/widgets/uigamemap.lua

@@ -17,6 +17,7 @@ function UIGameMap:onDragEnter(mousePos)
 
   self.currentDragThing = thing
   g_mouse.setTargetCursor()
+  self.cancelNextRelease = true
   return true
 end
 

modules/game_interface/widgets/uiitem.lua

@@ -53,7 +53,7 @@ end
 function UIItem:onHoverChange(hovered)
   UIWidget.onHoverChange(self, hovered)
 
-  if self:isVirtual() then return end
+  if self:isVirtual() or not self:isDraggable() then return end
 
   local draggingWidget = g_ui.getDraggingWidget()
   if draggingWidget and self ~= draggingWidget then
@@ -93,7 +93,7 @@ function UIItem:onMouseRelease(mousePosition, mouseButton)
 end
 
 function UIItem:canAcceptDrop(widget, mousePos)
-  if self:isVirtual() then return false end
+  if self:isVirtual() or not self:isDraggable() then return false end
   if not widget or not widget.currentDragThing then return false end
 
   local children = rootWidget:recursiveGetChildrenByPos(mousePos)

modules/game_market/market.otmod

@@ -4,6 +4,6 @@ Module
   author: BeniS
   website: www.otclient.info
   sandboxed: true
-  scripts: [offerstatistic.lua, marketoffer.lua, marketprotocol.lua, market.lua]
+  scripts: [ offerstatistic.lua, marketoffer.lua, marketprotocol.lua, market.lua ]
   @onLoad: init()
   @onUnload: terminate()

src/client/item.cpp

@@ -210,9 +210,7 @@ int Item::getSubType()
 {
     if(isSplash() || isFluidContainer())
         return m_countOrSubType;
-    if(g_game.getProtocolVersion() >= 900)
-        return 0;
-    return 1;
+    return 0;
 }
 
 int Item::getCount()