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Make some more methods in QPDFPageObjectHelper work with form XObjects, provide forEach methods to walk through nested form XObjects, possibly recursively. This should make it easier to work with form XObjects from user code.
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Turns out unreadCh is much more efficient than seek(-1, SEEK_CUR). Update comments and code to reflect this.
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Make clear that you almost always want + or - before an angle when specifying rotation.
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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.
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Allow exit status-based checking of whether a file is encrypted or requires a password without necessarily supplying the correct password. Useful for scripting.
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For wildcard expansion to work properly with the msvc binary, it is necessary to link with setargv.obj or wsetargv.obj, depending on whether wmain is in use.