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Changelog:
=========
* Fix the training tools for the legacy OCR engine (fix issue #3925).
* PDF renderer: Ignore non-text blocks (fix issue #3957).
* Remove colormap before thresholding (fix issue #3940).
* Fix a number of performance issues reported by Coverity Scan.
* Training tools: Replace call of exit function by return statement in main function.
* Fix double free in function vigorous_noise_removal (fix issue #3876).
* Create to_win if needed in Textord::make_spline_rows (fix issue #3875).
* Bug fixes for ScrollView viewer:
* Fix memory issues in ScrollView::MessageReceiver.
* Catch potential nullptr in SVNetwork::SVNetwork.
* Move svpaint.cpp from src/viewer to src/.
* Add rule for svpaint executable in Autotools.
* Bug fixes and improvements for build tools:
* Fix AMD64 detection with autobuild on FreeBSD (fix issue #3964).
* Fix tesseract.pc generated from CMake to match Autotools.
* Detect availability of AVX512-VNNI.
* configure.ac: fix build on aarch64_be.
* Drop CI for old versions of macOS and Ubuntu.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
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