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It is redundant with qpdf's main CI environment, which is Azure Pipelines, but may soon be migrated to GitHub Actions.
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Make clear that you almost always want + or - before an angle when specifying rotation.
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When possible, use `for (auto&` or `for (auto const&` when iterating using C++-11 style iterators.
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Also switch to colon-style iteration in some cases. Thanks to Dean Scarff for drawing this to my attention after detecting some unnecessary copies with https://clang.llvm.org/extra/clang-tidy/checks/performance-for-range-copy.html
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A class can't have a PointerHolder to itself since PointerHolder doesn't have the concept of weak references.
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This is needed for some compilers on some platforms, notably current versions of clang.
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This uses C++-11 thread-safe static initializers now.
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Explicitly enable openssl crypto provider in the linux and sanitizer builds, and disable it in the windows build.
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Fixes qpdf/qpdf#417
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Issue #399 mentioned a use case for which qpdf has support, but the fact that it is supported was not documented or in the test suite, making it vulerable to accidental breakage.