When in the inventory, you have to drag items by holding onto the mouse where as in previous versions before 1.8.4, you could do this without holding onto the mouse.
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duplicates
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migrated
MC-80676
Dragging items in the inventory
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Minecraft 1.8.4, Minecraft 1.8.5, Minecraft 1.8.6
Retrieved
Disable touchscreen mode in the settings.