Commits on Jun 1, 2024

1. Prevent infinite DAG growth …

   In some circumstances where files repeatedly get updated, such as when a
   .xrl file re-generates a .erl file on each compile run, the DAG analysis
   would repeatedly re-add edges for this file's dependencies (such as
   include files) to the DAG. Since the digraph module de-dupes vertices
   but not edges (duplicate edges is a valid use case), we add an explicit
   check for edge presence before re-adding them.
   
   This should properly prevent unexpected growth of DAG files.
   
   From manual testing, we get stability when going from a fresh DAG, but
   if it already had many dupes, the file size may jump around a bit
   regardless.

   

   ferd committed Jun 1, 2024
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