I'd like a better understanding (well, *any* understanding) of what
"Startup Notification Support" is.
Can someone explain to me what enabling this option does,
what happens if some components have it enabled and others don't,
and what behavior is present / missing if it is disabled all over?
Startup notification is that spinning cursor that you see after you've clicked a launcher but before the application appears on the desktop. Note that the application itself has to support this notification for the spinning cursor to appear. You'll notice that in the properties dialog of all launcher items and available as an option in .desktop files, you can specify startup notification.
So it doesn't actually do anything useful, then? Just provides the linux equivilant of the Microsoft hurry-up-and-wait hourglass so that the user knows that whatever app hasn't appeared on the screen yet... hasn't appeared on the display yet?
No, it does do something: it tells you that the application is running, even though there's nothing visible on the screen yet.
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