Add set-title events for views

[Uks2]

Outputs get events that trigger before and after all their windows get drawn.

Views get events that trigger when a window's title is changed so I can keep my status bar up to date.

[ghost]

If kiwmi migrates to wlr_scene, the pre/post-render events will have to be replaced (also see #60, pls comment if you can). Would you mind splitting the PR into two, or possibly only keeping the title_change? (Would need a comment from buffet on what’s preferred, yay.)

[Uks2]

If kiwmi migrates to wlr_scene, the pre/post-render events will have to be replaced (also see #60, pls comment if you can)

I have no idea how the scene graph system works, so I'll keep quite on that one.

Would you mind splitting the PR into two, or possibly only keeping the title_change? (Would need a comment from buffet on what’s preferred, yay.)

Either way is fine by me. I'll wait for word from on high then do what I'm told.

[ghost]

I have no idea how the scene graph system works, so I'll keep quite on that one.

The main point is, instead of rendering things ourselves, we say where they should be and tell the wlr_scene to render them all for us. Therefore we can’t pop in just before/after something’s gonna render (i’m not exactly sure how it’s for outputs’ post-render), but rather say ‘draw this&this below/above this&this’.

It’s only a change in how things are achieved, and what i’m saying is, we don’t necessarily want to introduce something that would soon be replaced.

[Uks2]

Okay, that makes sense.

I've just had a quick look though wlr_scene.h and it seems like you're able to create coloured rectangles and add them to you scene graph. We might be able to wrap that up in an output:draw_rect() lua function, with just an extra parameter for whether it goes above or below the windows. How you delete those rectangles is another matter though.

...or we go nuts and create a whole API for drawing on wlr_buffers. :)

I'll try to have a rummage though #50 at some point and look at what the practicalities are.

[ghost]

We might be able to wrap that up in an output:draw_rect() lua function, with just an extra parameter for whether it goes above or below the windows. How you delete those rectangles is another matter though.

...or we go nuts and create a whole API for drawing on wlr_buffers. :)

See #60 (comment)

[ghost]

Apart from this detail and the above comment, looks good to me.

[Uks2]

Changed event name, removed pre- and post-render events and rebased on top of the scene graph changes