Version 3.8.4
Attempt to work around MSVC's treatment of __LINE__ as a non-constant value
in "Edit and Continue" mode by avoiding the use of __LINE__ when
SQLITE_VDBE_COVERAGE is not defined.
Adjustments to the cost computation for the skip-scan query plan, to take
into account the fact that a seek has to occur on each skip.
Add a test to see what happens if an rtree constructor encounters an SQLITE_BUSY error. No changes to code.