Improve test of text rendering

crates/egui_demo_lib/tests/misc.rs

@@ -13,8 +13,9 @@ fn test_kerning() {
                     ui.label("Hello world!");
                     ui.label("Repeated characters: iiiiiiiiiiiii lllllllll mmmmmmmmmmmmmmmm");
                     ui.label("Thin spaces: −123 456 789");
-                    ui.label("Ligature: fi :)");
-                    ui.label("\ttabbed");
+                    ui.label("Ligature: fi fl ffi ffl");
+                    ui.label("Kerning: AVATAR");
+                    ui.label("\ttabbed\ttext");
                 });
             harness.run();
             harness.fit_contents();

crates/egui_demo_lib/tests/snapshots/image_kerning/image_dark_x1.png

@@ -1,3 +1,3 @@
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+size 15428

crates/egui_demo_lib/tests/snapshots/image_kerning/image_dark_x2.png

@@ -1,3 +1,3 @@
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crates/egui_demo_lib/tests/snapshots/image_kerning/image_light_x1.png

@@ -1,3 +1,3 @@
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+size 16122

crates/egui_demo_lib/tests/snapshots/image_kerning/image_light_x2.png

@@ -1,3 +1,3 @@
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