Build only the changed 'md' files, which can save a lot of project build time

[zhanenkui]

I want to get the PDF file in time after modifying the 'md' file

enabled_if_env
Setting this option will enable the build,But it has only two states, either to start building or not to build

After I modify the "md" source file, I start building the project.Is it possible to build only the modified files instead of all the files? It takes me too long to build the project each time.