What's Changed

• Fix memory issues in ScrollView::MessageReceiver by @p12tic in https://github.com/tesseract-ocr/tesseract/pull/3872
• autotools: Add rule for svpaint executable by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3873
• Replace call of exit function by return statement in main function by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3878
• Fix the build on CodeQL/Analyze by @arseniy-sonar in https://github.com/tesseract-ocr/tesseract/pull/3888
• CI: Remove Ubuntu 18.04 by @amitdo in https://github.com/tesseract-ocr/tesseract/pull/3902
• configure.ac: fix build on aarch64_be by @ffontaine in https://github.com/tesseract-ocr/tesseract/pull/3907
• SW CI: Add paths filter by @amitdo in https://github.com/tesseract-ocr/tesseract/pull/3908
• Create .mailmap by @amitdo in https://github.com/tesseract-ocr/tesseract/pull/3910
• Fix tesseract.pc from cmake to match autotools by @jeroen in https://github.com/tesseract-ocr/tesseract/pull/3930
• Update README.md by @nicholasz2510 in https://github.com/tesseract-ocr/tesseract/pull/3935
• Fixed 2 errors by @Gitoffthelawn in https://github.com/tesseract-ocr/tesseract/pull/3938
• fix issue #3940 - remove colormap before thresholding by @zdenop in https://github.com/tesseract-ocr/tesseract/pull/3942
• Update upload-artifact action by @rettinghaus in https://github.com/tesseract-ocr/tesseract/pull/3949
• Update checkout action to version 3 by @rettinghaus in https://github.com/tesseract-ocr/tesseract/pull/3948
• Fix Markdownlint by @Saibamen in https://github.com/tesseract-ocr/tesseract/pull/3950
• Fix broken links in CONTRIBUTING.md by @doraeric in https://github.com/tesseract-ocr/tesseract/pull/3951
• pdfrenderer.cpp: Ignore non-text blocks by @amitdo in https://github.com/tesseract-ocr/tesseract/pull/3959
• lstm.train: allow .box from .raw.png too by @bertsky in https://github.com/tesseract-ocr/tesseract/pull/3962
• Fix a number of performance issues (reported by Coverity Scan) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3967
• Fix training tools for legacy engine (issue #3925) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3970
• Fix function tesseract::WriteFeature (issue #3925) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3972
• Modernize function ObjectCache::DeleteUnusedObjects (fix issue with s… by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3978
• More fixes for issue #3925 by @stweil in https://github.com/tesseract-ocr/tesseract/pull/3977

New Contributors

• @p12tic made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3872
• @arseniy-sonar made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3888
• @nicholasz2510 made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3935
• @rettinghaus made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3949
• @Saibamen made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3950
• @doraeric made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/3951

Full Changelog: https://github.com/tesseract-ocr/tesseract/compare/5.2.0...5.3.0-rc1