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#956 from rogday:split_expand
#959 from rogday:lstm
#962 from chacha21:tiff_10_12_14
#965 from AleksandrPanov:fix_filterTooCloseCandidates
#969 from AleksandrPanov:fix_testBoardSubpixelCoords
#970 from rogday:21852_fix
Main PR: opencv/opencv#21903
Previous "Merge 4.x": #960