Avoid irrelevant warning notifications in app kittest snapshot (#11354)

Author: MichaelGrupp

crates/viewer/re_ui/src/context_ext.rs

@@ -106,7 +106,7 @@ pub trait ContextExt {
         let traffic_button_sizes_fallback = egui::vec2(64.0, 24.0); // source: I measured /emilk
 
         #[cfg(target_os = "macos")]
-        let native_buttons_size_in_native_scale = {
+        let native_buttons_size_in_native_scale = if make_room_for_window_buttons {
             use crate::egui_ext::WindowChromeMetrics;
             use raw_window_handle::HasWindowHandle as _;
 
@@ -125,6 +125,8 @@ pub trait ContextExt {
                 }
                 traffic_button_sizes_fallback
             }
+        } else {
+            egui::Vec2::ZERO
         };
         #[cfg(not(target_os = "macos"))]
         let native_buttons_size_in_native_scale = traffic_button_sizes_fallback;

crates/viewer/re_viewer/src/ui/top_panel.rs

@@ -20,7 +20,7 @@ pub fn top_panel(
 ) {
     re_tracing::profile_function!();
 
-    let style_like_web = app.is_screenshotting();
+    let style_like_web = app.is_screenshotting() || app.app_env().is_test();
     let top_bar_style = ui.ctx().top_bar_style(frame, style_like_web);
     let top_panel_frame = ui.tokens().top_panel_frame();
 

crates/viewer/re_viewer/src/viewer_test_utils/mod.rs

@@ -18,7 +18,11 @@ pub fn viewer_harness() -> Harness<'static, App> {
                 MainThreadToken::i_promise_i_am_only_using_this_for_a_test(),
                 build_info!(),
                 AppEnvironment::Test,
-                StartupOptions::default(),
+                StartupOptions {
+                    // Don't calculate memory limit in tests.
+                    memory_limit: re_memory::MemoryLimit::UNLIMITED,
+                    ..Default::default()
+                },
                 cc,
                 None,
                 AsyncRuntimeHandle::from_current_tokio_runtime_or_wasmbindgen()