I want to merge item classification and description extensions.

[zlsl]

You don't have a KItem script.  You have a KItemRefill script, but no KItem.  I looked.  And I found a flaw in KItemDesc (see the thread).

zlsl?  That's a nice script, but a bit limited.  I would use element tagging ito separate the items into their categories instead of listing all of them in those arrays.

In Kategoryzacja przedmiotów by Ayene, the initialize and refresh methods of Window_Item are rewritten.
in KItemDesc by kyonides, the initialize and draw_item methods of Window_Item are rewritten.  And Scene_Ttem's Main was rewritten with its own main_loop method added.

To use both, you WOULD need to have an initialize method for Window_Item that combines both.

SO.....

Place Kyo's script ABOVE Ayane's Category script.  Then place this patch below both:

Code:

#==============================================================================
# ** DerVV's Patch for KItemDesc and Kategoryzacja przedmiotów
#    Uses code based on kyonides's and ayane's work
#==============================================================================

#==============================================================================
# ** Window_Item
#------------------------------------------------------------------------------
#  This window displays items in possession on the item and battle screens.
#==============================================================================

class Window_Item < Window_Selectable
 #--------------------------------------------------------------------------
 # * Includables
 #--------------------------------------------------------------------------
 include AYE::ITEM_CAT
 #--------------------------------------------------------------------------
 # * Object Initialization
 #--------------------------------------------------------------------------
 def initialize
   battle = $game_temp.in_battle
   w = battle ? 640 : 320
   super(0, 64, w, 352)
   if battle
     self.y = 64
     self.height = 256
     self.back_opacity = 160
   else
     super(0, 64, 640, 352)
   end
   @column_max = 2
   unless $game_temp.in_battle
     category(0)
     self.active = false
   end
   refresh
   self.index = 0  
 end
end

First of all, sorry for the slow response and thank you for your help!
I'm impressed by the magic.

I didn't want to bother my friend, but I want to talk about a bug he patched him.
First of all, the script works well without crashing!
However, if you press (Input :: B) to exit the menus and maps, the item window remains. Does typing '@ item_window.dispose' solve the problem?
I put 'dispose' in several places and the item window remains on the map.