Don't use full indexes unnecessarily on legacy Gemfiles #6916
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What was the end-user or developer problem that led to this PR?
On legacy Gemfiles with multiple remote sources, where all of them support the compact index API, we were still falling back to full indexes, making things slow.
What is your fix for the problem, implemented in this PR?
My fix to to remove the special case of "multiple remote Gemfile is involved" and change it to "at least one remote that only supports full indexes is involved".
Fixing this also allows to simplifying the code.
Make sure the following tasks are checked