This is a solution in response to the issues mentioned in comments on
rBe4f1d719080a and T103088.
Apparently the workaround of checking if the mouse is already inside
the area on the next event doesn't work for some tablets.
Perhaps the order of events or some very small jitter is causing this
issue on tablets. (Couldn't confirm).
Whatever the cause, the solution of checking the timestamp of the event
and thus ignoring the outdated ones is theoretically safer.
It is the same solution seen in MacOS.
Also calling `SendInput` 3 times every warp ensures that at least one
event is dispatched.
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