Add kittest snapshot test of italics (#7603)

crates/egui_demo_lib/tests/misc.rs

@@ -24,3 +24,28 @@ fn test_kerning() {
         }
     }
 }
+
+#[test]
+fn test_italics() {
+    for pixels_per_point in [1.0, 2.0_f32.sqrt(), 2.0] {
+        for theme in [egui::Theme::Dark, egui::Theme::Light] {
+            let mut harness = Harness::builder()
+                .with_pixels_per_point(pixels_per_point)
+                .with_theme(theme)
+                .build_ui(|ui| {
+                    ui.label(egui::RichText::new("Small italics").italics().small());
+                    ui.label(egui::RichText::new("Normal italics").italics());
+                    ui.label(egui::RichText::new("Large italics").italics().size(22.0));
+                });
+            harness.run();
+            harness.fit_contents();
+            harness.snapshot(format!(
+                "image_blending/image_{theme}_x{pixels_per_point:.2}",
+                theme = match theme {
+                    egui::Theme::Dark => "dark",
+                    egui::Theme::Light => "light",
+                }
+            ));
+        }
+    }
+}

crates/egui_demo_lib/tests/snapshots/image_blending/image_dark_x1.00.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:23be15ddddc13f9628a4dc15cdc32132274a0db5e16c6b1df5cadae3d5ba55ce
+size 7125

crates/egui_demo_lib/tests/snapshots/image_blending/image_dark_x1.41.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:abfa00ef9385d380bbd188d6254f92d6839a94f368100e75a2780337438f969f
+size 11068

crates/egui_demo_lib/tests/snapshots/image_blending/image_dark_x2.00.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5e5c9015e2005429ba83a407ed1f7d4dfbf30624f666152e82079c6ed3b3cda5
+size 17238

crates/egui_demo_lib/tests/snapshots/image_blending/image_light_x1.00.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3319a8bca1213fc3a2dd91ead155be1e25045bc614701250bc961848cfc42176
+size 7327

crates/egui_demo_lib/tests/snapshots/image_blending/image_light_x1.41.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5172aa12f07b4abf4bb217b8952b4cf5cf61b688455751964a1b54433d8c05b1
+size 11709

crates/egui_demo_lib/tests/snapshots/image_blending/image_light_x2.00.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5e3eedd952d4416af73179451c0c90bcb76635c9c3c94d37f42bdd228ddbdd03
+size 18802