[SpeedDial] Prevent opening when hovering closed actions

[mbrookes]

Also allows interaction with elements beind the actions when closed

Closes #11138
Closes #12082

[zanerock]

When I updated to this, the pointerEvents: 'none' style set on the root was suppressing the hover on my FAB and rendering it inoperable (I'm assuming it never gets the mouseover and so never opens). I have quite a bit of local styling, but even when I stripped everything away, it still didn't function (though there may be user error at this point). In general, though, this would seem to suppress opening onMouseOver, no?

[mbrookes]

Does it work for you in the docs?

[zanerock]

It does. I'll do some debugging on this next chance I get and isolate what's going on in my app.

[zanerock]

Just to close the loop here: we ended up factoring out the FAB, and given my current demands, I won't be following up on this issue anytime soon. I've saved the customized FAB component for future, though, so if it's still an issue if/when we do re-use it, I will certainly follow up then.