malaperle added a comment. I'm not sure it's better to use the InclusionDirective callback for this. We need to get the includes in two places: in the preamble and non-preamble. In the preamble we use the callback, have to store some temporary stuff because we don't have a SourceManager in InclusionDirective, then in finish we use the SourceManager to convert everything. In the non-preamble, we cannot use the callback so we use the SourceManager to go through the includes. Therefore, we have to maintain two different ways of getting the inclusion map. Without using the InclusionDirective callback, we use the SourceManager in both cases and can use the same code to iterate through inclusions, just on two different SourceManagers at different moments. We also don't need to make another patch to modify the PreambleCallbacks. I also double this is much slower but I think this simplifies the code nicely. What do you think?
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