iOS: touching sub-menu closes parent PopupMenu

I’ve done some testing, and sadly don’t see a way for a quick fix.

The PopupMenu is indeed broken on touchscreen displays, that much I can confirm. However I can’t see a difference in behaviour when testing with the “Nested Sub-Menus” part of the Widgets demo, and rolling back 557d690ff. In fact I can’t see a difference in behaviour between the current develop, and as far back as 7.0.0.

The mentioned commit fixes a reproducible bug, so the fix can’t be as simple as reverting that commit either.

Can you confirm, that for your particular use-case rolling back the changes in 557d690ff fixes all observable problems? This will be a useful datapoint, when we get around to a more thorough fix of the PopupMenu class.