Factorio Forums

With the change:

Most of the gui elements now work only with left mouse button, so other buttons might be used without interfering with gui.

the ability to right click an icon under components to remove all of that item type from the blueprint is gone.
(For clarity: Take big blueprint, right click the icon of small electric poles, all small electric poles are removed from blueprint. One click, many items removed)

Right clicking on the preview are still works, but the components portion broke between 15.12 and 15.13

I also noticed this, I made a post about it but then noticed this one and it was a much better explanation than mine so I deleted mine as it was a duplicate.

Note that right click and dragging on the preview to remove (or restore) items is also broken.

Duplicate of viewtopic.php?f=30&t=48354 which is already fixed for the next release