[tree] Fix tree widget mouse handling

[LinuCC]

Instead of only listening to list.key(), which ignores mouse-clicks,
we use the lists own select event to re-propagate the trees select
event.
This way the mouse-clicks also trigger the select.
Since the existing options.keys are also passed to the blessed.list()
and thus influence its select event, they should behave exactly the
way they did til now.

[lirantal]

@LinuCC we can continue working on this PR

[LinuCC]

@lirantal is there anything I can do to get this fix merged?

[lirantal]

Wasn't aware that this is the finished version :-)
What's a good way to test it to make sure we're not breaking anything? Do we have some uses for this case in examples/ that I can run and test it?

[LinuCC]

Thank you for the resopnse!
I have only verified this on my own non-public project, my bad ;)
I will have a look at the examples this evening to come up with some test cases.

[lirantal]

I don't want to block this off if you fixed it and believe you got it right. I'd be happy if you could quickly test it out with some edge cases and let's push it in.

Ping me when you are ready :)

[LinuCC]

Welp, I assumed passing all the keys to blessed.list will handle the selection, but it does not;
it uses the keys param differently.
In this PR, only enter works to select an item (besides the now working mouse clicks) instead of arbitrarily specifiable keys.
I will need to change some things around to make this work.

[lirantal]

Thanks for looking into it more deeply.
I'm happy to merge if you're up for fixing it up

[LinuCC]

Will do once I have time! Won't take a year again, I promise ;)

[lirantal]

No worries, there's no rush.
Take the weekend to relax and don't burn out ❤️

[yboujraf]

Any feedback.

Best regards,

[LinuCC]

Uh, right, testing this thing.
I am kind off busy now and I personally don't need this feature anymore, so I guess we can close it if nobody else is interested in this feature.

Will do once I have time! Won't take a year again, I promise ;)

Well this aged like milk