Add clipboard support for X11 samples

[barotto]

Now Linux users can play with the sandbox demo too!

[mikke89]

Awesome! I had a look at this API at some point, and decided "nope". I'm glad you dived right into it! Kudos.

I had one issue while testing: It works well when I copy and paste between other windows, but trying to copy and paste within the RmlUi window itself does not work for me, it doesn't paste anything.

[barotto]

You're correct, I didn't check for that!
I'll fix it, should be easy enough.

[barotto]

I had a look at this API at some point, and decided "nope"

It's not that bad once you get the grasp of it. It's an event based system that allows the transfer of even gigs of data between apps without using system memory.
The problem is that documentation is mostly in the form of function reference...
In any case the Linux world is moving away from X11 and game developers should use abstraction libraries like SDL anyway.

[mikke89]

Right, I do see how this API can be quite powerful. It's a lot more work for something basic, but I can appreciate the advantages too.

It works well for me now, thanks again!