Merge recent enhancements from trunk.

FossilOrigin-Name: 5fbcb208d24d45169fc53ad8738dd3545d9bbd26b7434e31afc7f6419cd4e958

diff --cc manifest
index 9c330a0aad6bf085d479ff4f14b708a73f5ce854,df58f37956833ed14f1b6990cdd0acb41d3eb3e9..1fc001d55e918feceec9ecd8559cc1364ee2bd10
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Lexer\sand\sgrammar\srules\sfor\sa\sRETURNING\sclause\son\sDELETE/INSERT/UPDATE.\nActually\smaking\sthis\swork,\sthough,\swill\sinvolve\sa\slot\smore\scode\swhich\swill\nlikely\sslow\sdown\sprocessing\sfor\sthe\scommon\scase\swhere\sthere\sis\sno\nRETURNING\sclause.\s\sFurthermore,\sRETURNING\sseems\sto\sbe\sof\slimited\susefulness\nand\sit\sis\snot\sstandard\sSQL.\s\sSo\swe\sabandon\sit\shere.\s\sThese\sexperimental\nchanges\sare\sparked\sin\sa\sbranch\sas\san\shistorical\sreference.\s\sIf\scircumstances\nchanges,\swe\smight\stake\sup\sthe\scause\sagain\ssome\sday.
- D 2021-01-12T20:16:31.150
 -C Fix\san\sissue\swith\sIN\soperator\soptimization\sintroduced\sby\ncheck-in\s[4a43430fd23f8835]\sand\sdescribed\sby\sticket\s[ee51301f316c09e9].
 -D 2021-01-27T19:15:06.983
++C Merge\srecent\senhancements\sfrom\strunk.
++D 2021-01-27T20:35:22.698
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -481,10 -482,10 +482,10 @@@ F src/auth.c 8d1df0e2ef8bafbedd4f1fe4ba
  F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d
  F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
  F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
- F src/btree.c 0f9cb686871ae668817673f0823b55d1bcadbc86ea28bd22c590b064a8322d5a
+ F src/btree.c 47d9fe97d5c0d74506154e3597f8a23b81a00080751dc4d11fec91ee22796f4c
  F src/btree.h 285f8377aa1353185a32bf455faafa9ff9a0d40d074d60509534d14990c7829e
  F src/btreeInt.h 7614cae30f95b6aed0c7cac7718276a55cfe2c77058cbfd8bef5b75329757331
 -F src/build.c d4c06261b0e532523ede58dc511381a7a9c155132e4b65a6bb2ff76fe657793a
 +F src/build.c ba8af18891c07501a185ecd02a2bc13a593de9bfd59dbffa5d126780c0c9fb8e
  F src/callback.c d0b853dd413255d2e337b34545e54d888ea02f20da5ad0e63585b389624c4a6c
  F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
  F src/ctime.c 2a322b9a3d75771fb4d99e0702851f4f68dda982507a0f798eefb0712969a410
@@@ -545,7 -546,7 +546,7 @@@ F src/shell.c.in 9ebc74e4f05cfbd0f4a360
  F src/sqlite.h.in 0af968a1fa3c717261e1df0ed105fa7bddb4d82de7e0adb3eab49e6aa81b4de7
  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
  F src/sqlite3ext.h 61b38c073d5e1e96a3d45271b257aef27d0d13da2bea5347692ae579475cd95e
- F src/sqliteInt.h de0ba6b4f9bcddd665b4aa8feead3108e737536f061bad85992ffbad8050239f
 -F src/sqliteInt.h 3e5bc0446611e272b93754265e3265f36249d0458da25e32991fce241d69dbcf
++F src/sqliteInt.h c005efbb5f58d5dc41d1b61ffe253d6cd02b3f58b7126a59311a452df00a007a
  F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
  F src/status.c 4b8bc2a6905163a38b739854a35b826c737333fab5b1f8e03fa7eb9a4799c4c1
  F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@@ -1895,10 -1898,8 +1898,7 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 35824c1bcbd89ae4a94acfbe511bfbd888c418b981819e72bc9a991fc82d136c
- R f88ede067372ddc1781e1314bfb966d4
- T *branch * returning
- T *sym-returning *
- T -sym-trunk *
 -P 0571c24177d77ac966bcf42cb8ab00fdf541ce84af1468c8ef0b60c48c45a22f 390cf60a286b13f454429f4652a133f95a7891a75c1ec6d16cd39990590fd3fb
 -R 4574041b82ab28e377188abbe28af4d5
 -T +closed 390cf60a286b13f454429f4652a133f95a7891a75c1ec6d16cd39990590fd3fb
++P abf8da815646055df5b871d54b99994c1470182dee7952fc5fd627e4379406cb 9dc7fc9f04d5c14fc436e5ff5b4c06c1969ddde5857ebeb5dccd59b7c748c339
++R c54312b71d94f0a561db44774385038e
  U drh
- Z a56a87fefbb361b1248407b671a1766d
 -Z 071fbdee3969843efb30cf74f43578ee
++Z 06a1968b90bf816dd044f7df827fd184

diff --cc manifest.uuid
index 1bce0b6baabd48fc43288454e8aeddd88094c541,29b10f4d3bd6ef124669e5d98d7ff76afc60a0fa..67bfdfa6c9d0a93aba3c0f7c1b4ce702c127f32e
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- abf8da815646055df5b871d54b99994c1470182dee7952fc5fd627e4379406cb
 -9dc7fc9f04d5c14fc436e5ff5b4c06c1969ddde5857ebeb5dccd59b7c748c339
++5fbcb208d24d45169fc53ad8738dd3545d9bbd26b7434e31afc7f6419cd4e958

diff --cc src/sqliteInt.h
Simple merge