Philipp Schaffrath 166f044fd0 gpui: Linux wayland set exclusive zone and edge (#60163)
# Objective

The exclusive zone and exclusive edge of a wlr-layer-shell surface could
only be set once, at creation, through `LayerShellOptions`. This adds
runtime setters so a live layer-shell window such as a panel can update
them without being recreated.

## Solution

Add two methods on `Window`:

- `set_exclusive_zone` updates how much screen space the surface
reserves. A positive value reserves that distance from the anchored
edge, 0 lets the surface be moved out of others' exclusive zones, and -1
ignores reserved space and may extend under other surfaces.
- `set_exclusive_edge` chooses which anchored edge the exclusive zone
applies to, which is needed to disambiguate a corner-anchored surface.

Setting an exclusive edge the surface is not anchored to is a fatal
protocol error, so the edge is validated (it must be a single edge that
the surface anchor contains) and an invalid edge is logged and ignored.
The same validation now also guards the creation path. Both setters only
commit the surface when a change actually applies, and are no-ops on
non-layer-shell windows and on other platforms.

This is where these 2 are documented:

https://wayland.app/protocols/wlr-layer-shell-unstable-v1#zwlr_layer_surface_v1:request:set_exclusive_zone

https://wayland.app/protocols/wlr-layer-shell-unstable-v1#zwlr_layer_surface_v1:request:set_exclusive_edge

## Testing

- Verified with a small local layer-shell window (a top bar anchored
TOP, LEFT, RIGHT) with buttons that call the setters at runtime
- No automated test was added, since this calls through to the
compositor.
- Reviewers without a layer-shell capable compositor (for example
GNOME/Mutter) cannot exercise this, as `zwlr_layer_shell_v1` is
unavailable there, I tested this on the
[Smithay](https://github.com/Smithay/smithay/) based compositor
[niri](https://github.com/niri-wm/niri)

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- N/A
2026-07-15 08:18:46 +00:00
2026-07-14 14:49:06 +00:00
2026-05-27 18:17:59 +00:00
2026-01-22 23:57:26 +05:30
WIP
2023-12-14 09:25:14 -07:00
2026-04-29 10:27:47 +00:00
2025-02-04 09:02:59 -05:00
2025-10-27 13:27:59 -04:00
2026-06-27 15:06:29 +00:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00
2026-04-29 10:27:47 +00:00

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