ET++: Stepping through the redraw of a changed ImageItem
Details may vary from port to port, but in the XWindows port of ET++, this
method is called repeatedly from the inner event loop (see the Event
Handling discussion for more information on the event loop and this method's place in it).
After handling any pending events, this method calls
WindowSystem::Update().
bool XWinSystem::Notify()
{
Allow();
[ ... handle events ... ]
SetBusy(0);
Update();
XFlush(display);
return FALSE;
}
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