PDF合并工具，支持多个文件批量合并，简单好用！
Version 1.2
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* Files are sorted alphabetically when added via context menu (issue #10)
* Annotations (stamps, marks, comments) are preserved (issue #11)
Version 1.1
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* Original paper size(s) maintained when merging (issue #4)
* Page rotation is respected while merging (issue #5)
Version 1.0
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* First public release.
