Synthetic mouseevents generated from touch gestures are dispatched asynchronously
from the touch events. This means that the nsAutoRollup that the widget puts on
the stack during the dispatching of the touch events is no longer in scope when
we get around to firing the mouse events. As a result, the mouse events can end
up reopening rollups that got closed by the touch events and that shouldn't be
reopened. We fix this by stashing the rollup that was in scope while the touch
events were being dispatched, and make sure we keep that in scope for the
synthetic mouse events.
MozReview-Commit-ID: HjteKHfAqvD
This just decouples nsAutoRollup from the widget class, which it isn't really
bound to anyway because the internal data is static. We'll need to be able to
use nsAutoRollup independently in the next patch.
MozReview-Commit-ID: 1dxSLTr4g1K
