Merge trunk enhancements into the wal2 branch.

FossilOrigin-Name: 135133b7a65c652e95b0642bc2358425af72e46b1b6b64d256547b5e5e8f7e41

diff --cc manifest
index 0c1a6634c135ccf7ad81e067a4c2cfc5d67a0ddf,1d7058dd37866925ae5b1dc3cedbd26e29655a09..bb129b9b6c521eeb585d455a1b4593747d50b115
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Merge\sthe\slatest\strunk\senhancements\sinto\sthe\swal2\sbranch.
- D 2021-11-09T13:52:20.080
 -C Fix\sa\stypo\sin\smemdb1.test\spreventing\stests\sfrom\spassing\swith\s-DSQLITE_DEFAULT_AUTOVACUUM=1\sbuilds.
 -D 2021-11-22T16:27:36.788
++C Merge\strunk\senhancements\sinto\sthe\swal2\sbranch.
++D 2021-11-22T16:47:29.466
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -493,7 -491,7 +493,7 @@@ F src/auth.c f4fa91b6a90bbc8e0d0f738aa2
  F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d
  F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
  F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
- F src/btree.c c69775cb3b7ff6e5a48ea0f6f78de2df9549879c4f43ad81f18b0f6cd658b3e3
 -F src/btree.c 13b965a0f3cd57221e3b4e61e24452ec264a5b163de347b03b5039ddcd95cd54
++F src/btree.c 645d1259dd49b2c53089fdd5652e49b990f134d0932ef6955cac03eca225b674
  F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
  F src/btreeInt.h ee9348c4cb9077243b049edc93a82c1f32ca48baeabf2140d41362b9f9139ff7
  F src/build.c 1b41a6417e5bb260a5988588764863229905b07b3e9a47878030a1c92d49010f
@@@ -536,11 -534,11 +536,11 @@@ F src/os.c b1c4f2d485961e9a5b6b648c3668
  F src/os.h 26890f540b475598cd9881dcc68931377b8d429d3ea3e2eeb64470cde64199f8
  F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
  F src/os_setup.h 0dbaea40a7d36bf311613d31342e0b99e2536586
- F src/os_unix.c 8e14b40fd02f70e234030c2bee45215ff8835293adc13a08e9718c29bff61401
+ F src/os_unix.c f5ad51cfd024116db8531feab9efd831c2621436dca1464e4ff1e8af9bf3252e
  F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
  F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 -F src/pager.c bc10c191d18bffd3d76eda5f162799e43a9f875ecfe7c4869f752e2ddef87ea2
 -F src/pager.h 4bf9b3213a4b2bebbced5eaa8b219cf25d4a82f385d093cd64b7e93e5285f66f
 +F src/pager.c 144c2111216d51a34646824c77612ce997a79a77d2dca2afc8bb3ac323fc3390
 +F src/pager.h 9d38ac4b9f0e1361f7ddb6aa0675a54f5e4f085703108d3aafe7868872113f92
  F src/parse.y 0bd7971a7489bbf6c3726f1b50da6e508bdff8fa493e9cc3f5a96b12cbb2361e
  F src/pcache.c 084e638432c610f95aea72b8509f0845d2791293f39d1b82f0c0a7e089c3bb6b
  F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
@@@ -624,12 -622,12 +624,12 @@@ F src/upsert.c 8789047a8f0a601ea42fa025
  F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
  F src/util.c 30df8356e231dad33be10bb27897655002668343280004ba28c734489414a167
  F src/vacuum.c 6c38ddc52f0619865c91dae9c441d4d48bf3040d7dc1bc5b22da1e45547ed0b3
- F src/vdbe.c 03227424bdd3265be61d03f5725ba33add35fd716e40af5f158e73199f7bac59
 -F src/vdbe.c e98f1baf54a00db2c4669dbd04f8bbc89b5909a5b43e76fbbbf1a97007adba2b
++F src/vdbe.c 2e2fd664b5626fe7b46004d92b8ae70109b7b86fb00679ecaf7613569c645150
  F src/vdbe.h 25dabb25c7e157b84e59260cfb5b466c3ac103ede9f36f4db371332c47601abe
  F src/vdbeInt.h 31fbabdc1ed61d9695337dfe5269ea94e1cf615c17f5cafeaa1bb01066820bab
- F src/vdbeapi.c f4bd14b42d9717a35baac5f20c0c4bfccbf3691d64dc6ec02fc0ef19374d3c92
- F src/vdbeaux.c a57c760d1897f1b72f6fae26983df363db7a2c42d88721187e907f2c84862b42
- F src/vdbeblob.c 292e96c01c4219fca71d74e1002906d43eb232af4bd83f7552a3faec741f3eb8
+ F src/vdbeapi.c 22c79072ae7d8a01e9bcae8ba16e918d60d202eaa9553b5fda38f99f7464d99a
+ F src/vdbeaux.c 21db442d159fd745a7693d157b5f998260b6af4ca60de559fa3b7b68c7405af2
+ F src/vdbeblob.c 29c4118f7ee615cdee829e8401f6ead1b96b95d545b4de0042f6de39c962c652
  F src/vdbemem.c a3d91dc9bb9ef725db77e4e9de7e1acef43192c9f8406c307665d503e3c2837c
  F src/vdbesort.c 513b481c8bab4a6578c92194a60cf3bc3b48736e4a53f8d2d7918121c5b594e7
  F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf823
@@@ -1944,7 -1933,7 +1945,7 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 700876b79c47017cfbf42b8710ec0b50d7a987864db7599593817b962763bc71 de10795a1cf70925088e9652998e813665b2e147ffa4a4edab18c7e2c66bf5ae
- R 490a6a01f17478b9fef91dcfb9c1e660
 -P 0f567b61072e214c40cae1441889f83622a975f429b41803dfbed687718731c8
 -R e6e93a3640a0508d4351f1900ca6e978
 -U dan
 -Z 49b3684566eccc72791d638cff91caf3
++P 0894f59569378c41207b6cef43dbff9a4873582709d954c809c18f42d918aa03 eff4187c50790827d05bb28867cc6546196e7eee3b4c4de54b4e68bfb4e2830e
++R 29df751e9d2b3dd5633493dc71bda55f
 +U drh
- Z 8dd449c2a68fd4220a8dac9d19d7295f
++Z e98452ac933a4d5454c2583c02071760

diff --cc manifest.uuid
index b128f13116d8ec4badfdc9195fc87b8b0b738e39,d53492e456c43da1403c1f3bb491b5f8afc27903..c0405e6b91d5f223cb34f3ea6a4e0730ddef0fbd
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 0894f59569378c41207b6cef43dbff9a4873582709d954c809c18f42d918aa03
 -eff4187c50790827d05bb28867cc6546196e7eee3b4c4de54b4e68bfb4e2830e
++135133b7a65c652e95b0642bc2358425af72e46b1b6b64d256547b5e5e8f7e41

diff --cc src/btree.c
Simple merge

diff --cc src/vdbe.c
Simple merge