Add m_hasPendingItemUpdates to VIEW so UpdateItems() can
return immediately when no item has queued update flags.
The flag is set wherever m_requiredUpdate is modified and
cleared at the end of UpdateItems().
In DoRePaint(), check the new flag alongside IsDirty() and
cursor movement to skip both item processing and the GL
draw cycle when nothing has changed. Route onPaint through
Refresh() so the existing frame-rate throttle applies to
native paint events as well.
Seth Hillbrand
18c025f21f