GIMP 3.1.2 development release introduces adaptive brush previews and new paint blend mode

GIMP 3.1.2, the initial development release for GIMP 3.2, introduces an adaptive brush preview toggle that adjusts to theme colors, enhancing usability in dark mode. This release also adds a 'System Colors' scheme, ensuring GIMP matches system theme preferences on Windows and Linux. Users can also access the new Overwrite paint blend mode for direct pixel replacement without transparency blending. Note that development releases may contain instability and are intended for testing by early adopters and advanced users.