fix: prevent WARNING: Lua warning: member function call skipped becau…

modules/corelib/ui/uidragicon.lua

@@ -3,21 +3,32 @@ local uiIcon = nil
 
 function UIDragIcon:display(item)
     if modules.client_options.getOption('showDragIcon') then
-        uiIcon = g_ui.createWidget('UIDragIcon', rootWidget)
+        if uiIcon == nil then
+            uiIcon = g_ui.createWidget('UIDragIcon', rootWidget)
+            uiIcon:setVirtual(true)
+            uiIcon:setShowCount(false)
+        end
+
         uiIcon:setItem(item)
-        uiIcon:setVirtual(true)
-        uiIcon:setShowCount(false)
         uiIcon:show()
+
+        connect(rootWidget, { onMouseMove = onMouseMove })
     end
-
-    connect(rootWidget, { onMouseMove = onMouseMove })
 end
 
 function UIDragIcon:hide()
     if uiIcon ~= nil then
         uiIcon:hide()
+        disconnect(rootWidget, { onMouseMove = onMouseMove })
+    end
+end
+
+function UIDragIcon:destroy()
+    if uiIcon ~= nil then
+        disconnect(rootWidget, { onMouseMove = onMouseMove })
+        uiIcon:destroy()
+        uiIcon = nil
     end
-    disconnect(rootWidget, { onMouseMove = onMouseMove })
 end
 
 function onMouseMove(self, mousePos, mouseMoved)

modules/game_interface/widgets/uigamemap.lua

@@ -22,7 +22,7 @@ function UIGameMap:onDragEnter(mousePos)
         return false
     end
 
-    if not thing:isNotMoveable() then
+    if thing:isItem() and not thing:isNotMoveable() then
         UIDragIcon:display(thing)
     end
 

modules/game_interface/widgets/uiitem.lua

@@ -39,7 +39,7 @@ function UIItem:onDrop(widget, mousePos)
         return false
     end
 
-    if self.isVirtual() then
+    if self:isVirtual() then
         UIDragIcon:hide()
     end
 
@@ -83,7 +83,7 @@ function UIItem:onDestroy()
         self.hoveredWho:setBorderWidth(0)
     end
 
-    if self.isVirtual() then
+    if self:isVirtual() then
         UIDragIcon:hide()
     end