leggett
Can't drag mail into the hidden nav
Now that you can hover to show the nav, you'd expect to be able to drag mail into it. But it doesn't work.
A somewhat related discovery: If you try to drag a label from the top area of the side panel (above the "More"/"Less" marker) down to the lower area of the panel (beneath that marker), the entire side panel disappears as soon as you start dragging it.
You can actually still complete the action, but it's an odd experience since you lose all visuals while you're in the midst of it.
Clicking on the hamburger menu icon and pinning the side panel in place gets around this, but as long as you're in that hover view, the problem is present.
I am able to drag the conversation to the Hamburger menu to have it pop out. and If I take the conversation to the category I want and put my mouse on the far left edge of the screen it appears to highlight it and let me move the conversation. Doesn't work 100% of the time though, and I have to wiggle it around often to get the yellow highlight to appear around the hovered label.
