T20: on Wayland the window asks for ext_background_effect_v1 on its surface, through a guest connection on gpui's display; one region wider than any window, which the compositor clips, comes and goes with Blurred; the log names the way blur goes; a wayland-server compositor tests it, and scripts/linux.sh runs the tests on Linux in a container

Cargo.lock

@@ -1773,6 +1773,10 @@ dependencies = [
  "serde_path_to_error",
  "signal-hook",
  "unicode-normalization",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-server",
 ]
 
 [[package]]
@@ -7321,6 +7325,7 @@ dependencies = [
  "wayland-backend",
  "wayland-client",
  "wayland-scanner",
+ "wayland-server",
 ]
 
 [[package]]
@@ -7360,6 +7365,19 @@ dependencies = [
  "quote",
 ]
 
+[[package]]
+name = "wayland-server"
+version = "0.31.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dde9c29be0f723a573977de51ee455bf3dfa03652730a74f9dd3b337e374d75"
+dependencies = [
+ "bitflags 2.13.2",
+ "downcast-rs",
+ "rustix",
+ "wayland-backend",
+ "wayland-scanner",
+]
+
 [[package]]
 name = "wayland-sys"
 version = "0.31.11"