Add events for the scroll wheel in Linux. #2365
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My project uses several widgets, however I notice that the scroll wheel does not work on Linux.
In these two files, I add the events to buttons 4 and 5 (along with MouseWheel for Windows and MacOS) and assign a value for each interaction with button 4 (or 5).
Warning
I warn everyone about adding more events with other buttons (1, 2 and 3): in this case, these events maybe affect the user experience with the scroll wheel on Linux, because they interact with the conditional in self._parent_canvas.(x|y )view.
Thank you.