- it seems like layer.drawable_size() is 0,0 in metal_renderer.rs:189 
- we set this in two places:
    - in response to a CALayerDelegate setFrameSize: event
- in response to a CALayerDelegate viewDidChangeBackingProperties:
event.
- it looks like if we don't set it in either of these cases we get a
different failure mode: the view is zoomed just wrong.
- That said, I can reproduce the screenshot if .scale_factor() returns
0.
- This might happen if [nativeWindow screen] is nil, which happens when
the window is off screen.
    - possible that zed started with offscreen window?
- I would expect that viewDidChangeBackingProperties would fire when
that changed.
    - potential fix: default to 2.0

Release Notes:

- Fixed Zed occasionally rendering blank on laungh
([#2422](https://github.com/zed-industries/community/issues/2422)).