Prioritizing the best rendering platform over all supported rendering platforms

Author: mattkae

src/server/graphics/default_configuration.cpp

@@ -295,7 +295,17 @@ auto mir::DefaultServerConfiguration::the_rendering_platforms() ->
                     bool found_supported_device{false};
                     for (auto& device : supported_devices)
                     {
-                        if (device.support_level >= mg::probe::supported)
+                        if (device.support_level == mg::probe::best)
+                        {
+                            // In the case that we've discovered a best platform (most likely a hardware platform)
+                            // then we abandon all other platforms.
+                            // TODO: Remove me once a multi-rendering-platform paradigm is fully supported, and we
+                            // don't just select the first (or last?) platform and use that everywhere.
+                            platform_modules.clear();
+                            platform_modules.emplace_back(std::move(device), platform);
+                            break;
+                        }
+                        else if (device.support_level >= mg::probe::supported)
                         {
                             found_supported_device = true;
                         }