Only accept press-and-hold to enter Edit Mode, not click-and-hold
Press-and-hold is fairly common on touch UIs, but click-and-hold is a very rare interaction. As a result, the user is much more likely to enter Edit Mode accidentally while trying to drag something on the desktop than they are to know that click-and-hold works here and do it intentionally.
Let's disable click-and-hold and only enter Edit Mode with a press-and-hold using a touch device. For pointing device users, there are already multiple context menus items that will let them enter Edit Mode.
BUG: 457979 FIXED-IN: 5.26