Correctly handle SeekScan on an IN operator of the middle term of an index

when the right-most term is a range constraint.
Fix for ticket [5981a8c041a3c2f3].

FossilOrigin-Name: aa24660e76681d164b1948621d3dbd0f620c72c6bca636d35a9eed73ab7593fa

diff --cc manifest
index 369230c588a8b8c183398ddb5bb8f7e036f82418,fd01919a89aab230160d2b166e4a82d29a24f6f4..e3dc07bd99e110a69befd66f585ca6090696e761
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Ensure\sthat\sALTER\sTABLE\sRENAME\srecognizes\sOOM\serrors\swhile\sparsing\ndependent\striggers\sand\shandles\sthem\sappropriately.\ndbsqlfuzz\s53e245eee15d3f19639d773048aa955c30708785.
- D 2021-11-02T17:55:01.854
 -C Proposed\sfix\sfor\sa\sproblem\sassociated\swith\sOP_SeekScan\sthat\sresults\sin\san\nincorrect\sanswer.\s\sSee\sticket\s[5981a8c041a3c2f3].
 -D 2021-11-02T20:52:20.405
++C Correctly\shandle\sSeekScan\son\san\sIN\soperator\sof\sthe\smiddle\sterm\sof\san\sindex\nwhen\sthe\sright-most\sterm\sis\sa\srange\sconstraint.\nFix\sfor\sticket\s[5981a8c041a3c2f3].
++D 2021-11-02T22:24:19.545
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1930,7 -1930,10 +1930,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 4d70f27b7b5681cfdf1c44ac654e565ccff089e74d3edf6660578e04e4b0c9b9
- R 020065121bfbc86728d941bc72e402a9
 -P 1d9004cd015073853ce0ca811a68ea5411733eedee993b97a38a42ba139d7590
++P 1d9004cd015073853ce0ca811a68ea5411733eedee993b97a38a42ba139d7590 266e9cbada531716c908c21d60a6038109722e3dd040237679ac0240fb5020ea
+ R c61e36c2c71ed29e0021479206aa1f46
 -T *branch * seekscan-fix-20211102
 -T *sym-seekscan-fix-20211102 *
 -T -sym-trunk *
++T +closed 266e9cbada531716c908c21d60a6038109722e3dd040237679ac0240fb5020ea
  U drh
- Z e8c092d55961c0a6fa1569dc7a482ee4
 -Z e64ad9687c89edc17b6580d2562f23a1
++Z 49ea952deb1273256cba2a3e904b3452

diff --cc manifest.uuid
index ed9c4a74387384e8fb6423e2e406fad5c0a366f4,a58ff01aedc606ef38fcaeededae92c4125e2d27..1acdce8d97884cb1ef9d44373c640b9a7bcb94ba
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 1d9004cd015073853ce0ca811a68ea5411733eedee993b97a38a42ba139d7590
 -266e9cbada531716c908c21d60a6038109722e3dd040237679ac0240fb5020ea
++aa24660e76681d164b1948621d3dbd0f620c72c6bca636d35a9eed73ab7593fa