Regarding find_template_source()

[German M. Bravo]

I still find myself in need of getting a template source, the current find_template returns a compiled template for the most part, and I would suggest keeping a working find_template_source for these edge cases as mine. Perhaps something like this is in place:

def find_template_source(name, dirs=None):
    if template_source_loaders is None:
        loaders = []
        for loader_name in settings.TEMPLATE_LOADERS:
            loader = find_template_loader(loader_name)
            if loader is not None:
                loaders.append(loader)
        template_source_loaders = tuple(loaders)
    def load_template_source(loaders):
        for loader in loaders:
            if hasattr(loader, 'loaders'):
                try:
                    return load_template_source(loader.loaders)
                except TemplateDoesNotExist:
                    pass
            else:
                try:
                    source, display_name = loader.load_template_source(name, dirs)
                    return (source, make_origin(display_name, loader, name, dirs))
                except TemplateDoesNotExist:
                    pass
        raise TemplateDoesNotExist(name)
    return load_template_source(template_source_loaders)

[Aymeric Augustin]

This looks very similar to #15102.