[1.8.9]Problems with setInventorySlotContents

[TANDEROID]

I use this code to replace item in hotbar slot

 

((EntityPlayer) entity).inventory.setInventorySlotContents(5, new ItemStack(example.block, 1));

 

and this works, but if I use this item(RClick) it go back to the previous state. But! If I open inventory and pick it and put in any slot it won`t go back to the previous state after RClick.

[TANDEROID]

 

int selSlot = ((EntityPlayer) entity).inventory.currentItem ;

 

 

if (entity.capabilities.isCreativeMode) {
                              if (entity.inventory.getCurrentItem() != null && entity.inventory.getCurrentItem().getItem() == expand20.block) {

                                   if (true) {
                                        if (entity instanceof EntityPlayer)
                                             ((EntityPlayer) entity).inventory.setInventorySlotContents(selSlot, new ItemStack(expand10.block, 1));
                                   }

                                 

                              }
                         }

[TANDEROID]

Bigger code slice

 

 

 

public class KeyHandlerClass {

  private static final String desc = "Previous range";
  private static final int keyValues = Keyboard.KEY_LBRACKET;
  private final KeyBinding keys;

  public KeyHandlerClass() {
   keys = new KeyBinding(desc, keyValues, "World Edit helpers");
   ClientRegistry.registerKeyBinding(keys);
  }

  @SubscribeEvent
          public void onKeyInput(InputEvent.KeyInputEvent event) {
               if (!FMLClientHandler.instance().isGUIOpen(GuiChat.class)) {
                    if (keys.isPressed()) {
                         EntityPlayer entity = Minecraft.getMinecraft().thePlayer;
                         

                         MinecraftServer server = FMLCommonHandler.instance().getMinecraftServerInstance();
                         World world = server.worldServers[0];
                   
                         int selSlot = ((EntityPlayer) entity).inventory.currentItem ;

 

                      
                       if (entity.capabilities.isCreativeMode) {
                           if (entity.inventory.getCurrentItem() != null && entity.inventory.getCurrentItem().getItem() == expand20.block) {

                                   if (true) {
                                        if (entity instanceof EntityPlayer)
                                             ((EntityPlayer) entity).inventory.setInventorySlotContents(selSlot, new ItemStack(expand10.block, 1));
                                             
                                   }

                                  

                              }
                         }
                      

 

 

                        
                    }
               }
          }
 }
}

Edited August 19, 2017 by TANDEROID

[TANDEROID]

2 minutes ago, diesieben07 said:

What you are doing there is known as reaching across logical sides and it's a very bad idea. If you want a key binding to trigger a server-side action you must send packets.

Sorry, but the most of this code isn`t mine, I use ModCreator, so I understend not more the 20% of that. I just want to solve this problem. So, my problem was called by reaching across logical sides, or the reason not here?