Include test windows in `egui_demo_lib` snapshot tests (#7070)

Cargo.lock

@@ -1343,6 +1343,7 @@ dependencies = [
  "egui",
  "egui_extras",
  "egui_kittest",
+ "image",
  "mimalloc",
  "rand",
  "serde",

crates/egui_demo_lib/Cargo.toml

@@ -43,7 +43,7 @@ syntect = ["egui_extras/syntect"]
 
 [dependencies]
 egui = { workspace = true, default-features = false, features = ["color-hex"] }
-egui_extras = { workspace = true, features = ["default", "file", "svg"] }
+egui_extras = { workspace = true, features = ["image", "svg"] }
 
 unicode_names2 = { version = "0.6.0", default-features = false } # this old version has fewer dependencies
 
@@ -57,7 +57,9 @@ serde = { workspace = true, optional = true }
 [dev-dependencies]
 criterion.workspace = true
 egui = { workspace = true, features = ["default_fonts"] }
+egui_extras = { workspace = true, features = ["image", "svg"] }
 egui_kittest = { workspace = true, features = ["wgpu", "snapshot"] }
+image = { workspace = true, features = ["png"] }
 mimalloc.workspace = true                                            # for benchmarks
 rand = "0.9"
 

crates/egui_demo_lib/src/demo/demo_app_windows.rs

@@ -13,6 +13,16 @@ struct DemoGroup {
     demos: Vec<Box<dyn Demo>>,
 }
 
+impl std::ops::Add for DemoGroup {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self {
+        let mut demos = self.demos;
+        demos.extend(other.demos);
+        Self { demos }
+    }
+}
+
 impl DemoGroup {
     pub fn new(demos: Vec<Box<dyn Demo>>) -> Self {
         Self { demos }
@@ -367,7 +377,12 @@ mod tests {
 
     #[test]
     fn demos_should_match_snapshot() {
-        let demos = DemoGroups::default().demos;
+        let DemoGroups {
+            demos,
+            tests,
+            about: _,
+        } = DemoGroups::default();
+        let demos = demos + tests;
 
         let mut results = SnapshotResults::new();
 
@@ -377,13 +392,10 @@ mod tests {
                 continue;
             }
 
-            // Remove the emoji from the demo name
-            let name = demo
-                .name()
-                .split_once(' ')
-                .map_or(demo.name(), |(_, name)| name);
+            let name = remove_leading_emoji(demo.name());
 
             let mut harness = Harness::new(|ctx| {
+                egui_extras::install_image_loaders(ctx);
                 demo.show(ctx, &mut true);
             });
 
@@ -406,4 +418,13 @@ mod tests {
             results.add(harness.try_snapshot_options(&format!("demos/{name}"), &options));
         }
     }
+
+    fn remove_leading_emoji(full_name: &str) -> &str {
+        if let Some((start, name)) = full_name.split_once(' ') {
+            if start.len() <= 4 && start.bytes().next().is_some_and(|byte| byte >= 128) {
+                return name;
+            }
+        }
+        full_name
+    }
 }

crates/egui_demo_lib/tests/snapshots/demos/Clipboard Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b4f807098e0bc56eaacabb76d646a76036cc66a7a6e54b1c934fa9fecb5b0170
+size 26470

crates/egui_demo_lib/tests/snapshots/demos/Cursor Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:629006243b61f25e48a454cc617b8e49e38985eebbfe136f3bcb0b361d204671
+size 61431

crates/egui_demo_lib/tests/snapshots/demos/Grid Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c69c211061663cd17756eb0ad5a7720ed883047dbcedb39c493c544cfc644ed3
+size 99087

crates/egui_demo_lib/tests/snapshots/demos/ID Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8d31533f812b2b72410b5caafea9b647d3f4cc9da3db9fcf37c332cb57d58742
+size 111670

crates/egui_demo_lib/tests/snapshots/demos/Input Event History.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:502790125ddd0204ea8a468c80c6f3e824adcd98f5a3f626e97f3512d31e1074
+size 24516

crates/egui_demo_lib/tests/snapshots/demos/Input Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5fc9e2ec3253a30ac9649995b019b6b23d745dba07a327886f574a15c0e99e84
+size 50082

crates/egui_demo_lib/tests/snapshots/demos/Layout Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:18fe761145335a60b1eeb1f7f2072224df86f0e2006caa09d1f3cc4bd263d90c
+size 46560

crates/egui_demo_lib/tests/snapshots/demos/Manual Layout Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3110fab8444cb41dffe8b27277fa5dafd0d335aaf13dca511bcccc8b53fb25c8
+size 24046

crates/egui_demo_lib/tests/snapshots/demos/SVG Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f1e0657cae72e7ee117d8826bcd18685fd0cdd61d0d613685e4337533c7d4801
+size 23050

crates/egui_demo_lib/tests/snapshots/demos/Scene.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b4bf35ad4ce01122de5bc0830018044fd70f116938293fbeb72a2278de0bbb22
-size 35068
+oid sha256:0fcfee082fe1dcbb7515ca6e3d5457e71fecf91a3efc4f76906a32fdb588adb4
+size 35096

crates/egui_demo_lib/tests/snapshots/demos/Tessellation Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f90d56d40004f61628e3f66cfac817c426cd18eb4b9c69ea1b3a6fe5e75e3f05
+size 70354

crates/egui_demo_lib/tests/snapshots/demos/Window Resize Test.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8c0ce7090ba12d849f9e3c77010503b394f3e1fce65c382738f55f7181fd7450
+size 42527

crates/egui_extras/Cargo.toml

@@ -30,7 +30,7 @@ rustdoc-args = ["--generate-link-to-definition"]
 [features]
 default = ["dep:mime_guess2"]
 
-## Shorthand for enabling the different types of image loaders (`file`, `http`, `image`, `svg`).
+## Shorthand for enabling all the different types of image loaders.
 all_loaders = ["file", "http", "image", "svg", "gif", "webp"]
 
 ## Enable [`DatePickerButton`] widget.