Always run egui_demo_lib tests with chrono feature

Cargo.lock

@@ -1334,6 +1334,7 @@ dependencies = [
  "criterion",
  "document-features",
  "egui",
+ "egui_demo_lib",
  "egui_extras",
  "egui_kittest",
  "log",

crates/egui_demo_lib/Cargo.toml

@@ -56,6 +56,9 @@ serde = { workspace = true, optional = true }
 
 
 [dev-dependencies]
+# when running tests we always want to use the `chrono` feature
+egui_demo_lib = { features = ["chrono"], workspace = true }
+
 criterion.workspace = true
 egui_kittest = { path = "../egui_kittest", features = ["wgpu", "snapshot"] }
 wgpu = { workspace = true, features = ["metal"] }

crates/egui_kittest/src/snapshot.rs

@@ -72,6 +72,7 @@ pub fn try_image_snapshot(current: &image::RgbaImage, name: &str) -> Result<(),
 ///
 /// # Panics
 /// Panics if the image does not match the snapshot.
+#[track_caller]
 pub fn image_snapshot(current: &image::RgbaImage, name: &str) {
     match try_image_snapshot(current, name) {
         Ok(_) => {}