[3.11] gh-79579: Improve DML query detection in sqlite3 (GH-93623) #93800
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The fix involves using pysqlite_check_remaining_sql(), not only to check
for multiple statements, but now also to strip leading comments and
whitespace from SQL statements, so we can improve DML query detection.
pysqlite_check_remaining_sql() is renamed lstrip_sql(), to more
accurately reflect its function, and hardened to handle more SQL comment
corner cases.
(cherry picked from commit 4674007)
Co-authored-by: Erlend Egeberg Aasland erlend.aasland@protonmail.com