Cell Selection Model plugin allow Mac Command key + arrows to change the selection

[joaopapereira]

When using the Control Key + Arrow Key the plugin ensures that there are no changes to the selections ranges.
For Mac the combination Command Key + Arrow Key should have the same behavior.

Add some tests to the plugin to ensure it is working as expected.

[6pac]

This is a great pull request, but I have to ask: Macs have a Control key so why the need to extend to the Command key?

[joaopapereira]

Hello,
In Macs despite the existence of the control key the functions that typically are associated with it are done using Command key.
Like copy is Command + C
In that if statement we are excluding the handling of Control + Shift + Arrows by the model, in Mac it make sense to exclude Command + Shift + Arrows instead.

[6pac]

Of course. I use a Mac, but work in Windows using VirtualBox. Never occurred to me. Thanks.