[MC-108084] When in Creative's "Survival Inventory", dropping an item will not delete item from hand

Steps to reproduce:
1. Place any right-clickable block or item into any slot of the hotbar
2. Go to the Survival Inventory tab
3. Drop the item (Either by dragging it or pressing Q)
4. Exit the inventory
5. Right click on the ground with the same slot the block/item was, you should see that the item is still saved in that slot.

Code analysis by @unknown in this comment.

Linked issues

relates to

MC-81731 Dropped items are doubled in Creative, Survival inventory

Comments

marcono1234 2016-10-01T19:50:38Z

Relates to MC-2912

marcono1234 2016-10-01T20:08:30Z

Please link to this comment in the description

The following is based on a decompiled version of Minecraft 1.10 using MCP 9.30.

Server-side it looks like the intended behaviour is that the item count is not reduced (net.minecraft.network.NetHandlerPlayServer.processCreativeInventoryAction(CPacketCreativeInventoryAction), slotId = -1), however the client reduces the count (net.minecraft.client.gui.inventory.GuiContainerCreative.handleMouseClick(Slot, int, int, ClickType)).