Add performance benchmark tests for critical rendering paths including Measure/Arrange operations on flat layouts (100 children), deep nesting (20 levels), and Grid layouts (10x10). Include HitTest performance validation. Tests use Stopwatch with generous upper bounds to catch regressions while avoiding flaky failures on slow CI machines. Benchmarks verify operations complete within acceptable time budgets (5-10ms thresholds).
Implement SafeHandle wrappers for native resources (SafeGtkWidgetHandle, SafeGObjectHandle, SafeX11DisplayHandle, SafeX11CursorHandle, SafeDlopenHandle) to prevent memory leaks. Move gesture and rendering configuration from static properties to LinuxApplicationOptions for better testability and DI compatibility. Add THREADING.md and DI-MIGRATION.md documentation. Include LayoutIntegrationTests for Measure/Arrange pipeline and SkiaViewTheoryTests with parameterized test cases using [Theory] attributes.
Fix critical memory leaks identified in architecture review: Add signal handler disconnection in WebKitNative (load-changed and script-dialog signals now properly cleaned up), implement GTK idle callback cleanup with automatic removal on completion, add dlclose() calls for WebKit library handles, track GTK signal IDs in GtkSkiaSurfaceWidget for proper disposal. Replace empty catch blocks in GestureManager with logged exception handling. Add WebKitNative.Cleanup() and GtkNative.ClearCallbacks() methods for application shutdown.
Add comprehensive test coverage for 20+ Skia controls including ActivityIndicator, Border, CheckBox, CollectionView, DatePicker, Editor, Grid, Image, ImageButton, Label, NavigationPage, Page, Picker, ProgressBar, RadioButton, SearchBar, Stepper, Switch, and TimePicker. Include tests for TextRenderingHelper utility methods covering color conversion, font style mapping, and font family resolution.
