Change the drop button from "Q" to "Button 3"(mouse wheel click). Open your inventory. Click with the wheel button on a item. it doesn't drop...
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no, i changed it to "Z". yup, my control configs are unnusual...

No one will confirm this? =/

Confirmed.

i think this happen with button #1 and #2 too, but I haven't tested...

Hey! this is my first bug confirmed. Nice =D
Dropping is just for items you hold while no screens are open. I personally dislike this as it makes the mouse too mandatory. Priority to fix this is not super high though.

i will update this, it still a issue in 1.6 (very annoing for me, as i normaly use the middle mouse button as the drop button)

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

No response for over a year.
Are you still using Button 3 as your pick block key?