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Yasufumi Kinoshita authored
trx_undo_prev_version_build() should confirm existence of inherited (not-own) external pages. Bug #14676084 : ROW_UNDO_MOD_UPD_DEL_SEC() DOESN'T NEED UNDO_ROW AND UNDO_EXT INITIALIZED mtr script could hit the assertion error !bpage->file_page_was_freed using this path. So, also fixed rb://1337 approved by Marko Makela.
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