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Paul Eggert authored
Don't assume that the difference between two unsigned long values can fit into an integer. At this point, we know button_down_time <= event->timestamp, so the difference must be nonnegative, so there's no need to cast the result if double-click-time is nonnegative, as it should be; check that it's nonnegative, just in case. This bug is triggered when events are more than 2**31 ms apart (about 25 days).
8e55734a
