Too many mouse moves or key presses are counted by the console

kernel32:winetest and the following console demo app:
http://www8.cs.umu.se/kurser/TDBB09/VT01/console/
clearly show that we register too many mouse-move or key presses events, when they are the same.
A fix would be to check the current input event, compare it with the latest one in the input buffer, and merge them if they are the same.