Hello!
I think I found a bug (in version 2.1.0 build 73 beta RC1) : after pressing F2 to open the layout editor, if some of the buttons in the layout are disabled, and the user selects a button in the list, then clicks "Move left" or "Move right" to change that button's position, then the number of lines that this button is moved up or down isn't 1 for each click, but seems to be affected by how many disabled buttons exist in the direction which the selected button is being moved towards.
Additional information: I can't reproduce this with either version 2.0.6 or 2.1.0 build 25 beta, which I have kept on hand, so the problem must have been introduced since then.
Edited again: it may require to have more than 2 disabled buttons for the issue to happen.