When processing an "ORDER BY ... LIMIT" that does not use an index, check

whether or not a record may appear in the final result set before adding it to
the temp b-tree used for sorting.

FossilOrigin-Name: 0fcfc36ceb820fc70136b799a0405fe92e50646e697be2872bbe9a53a05ed5a9

diff --cc manifest
index 11e53dfe699e2266bf0e36ae7292642eb4c18699,21484880f4467e6a4bcb2eb4a2b6f1a7f4b4c1f0..d319175a99a6369a1f81419e4b4ab0a7f243e36a
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Ensure\sthat\snew.*\svalues\sof\san\sUPDATE\sdo\snot\sget\sclobbered\safter\sthe\nBEFORE\striggers\srun\swhen\sunmodified\scolumns\sof\sthe\srow\sbeing\supdated\sare\nreloaded.\s\sFix\sfor\sticket\s[d85fffd6ffe856092ed8da]
- D 2018-04-26T15:50:10.476
 -C When\sprocessing\san\s"ORDER\sBY\s...\sLIMIT"\sthat\sdoes\snot\suse\san\sindex,\scheck\nwhether\sor\snot\sa\srecord\smay\sappear\sin\sthe\sfinal\sresult\sset\sbefore\sadding\sit\sto\nthe\ssorter.
 -D 2018-04-26T16:13:47.273
++C When\sprocessing\san\s"ORDER\sBY\s...\sLIMIT"\sthat\sdoes\snot\suse\san\sindex,\scheck\nwhether\sor\snot\sa\srecord\smay\sappear\sin\sthe\sfinal\sresult\sset\sbefore\sadding\sit\sto\nthe\stemp\sb-tree\sused\sfor\ssorting.
++D 2018-04-26T17:43:35.709
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F Makefile.in 5ce9343cba9c189046f1afe6d2bcc1f68079439febc05267b98aec6ecc752439
@@@ -1725,7 -1725,10 +1725,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
--P 7bb23c2a3d37f0d5e5515b917860818906819d54a0066e1ba8e9792a82f7d279
- R fca770ecccc439d6123031b9ede2b90c
- U drh
- Z 0f59500027b236c3f3feca2847bff4bf
 -R 6079da62ec760c692d1ac980ae12bf44
 -T *branch * sorter-limit-opt
 -T *sym-sorter-limit-opt *
 -T -sym-trunk *
++P 0a514e62ad1ebe5c12da8daed429ae2f9d9910471d3c5cef3b6870bdadfefca1 71bf91c218334381b1b4bdba6a093e623b62e17f3e8550e154a11f0cb0b404f3
++R 4228df14b2641be536d92a6cbe9f519e
++T +closed 71bf91c218334381b1b4bdba6a093e623b62e17f3e8550e154a11f0cb0b404f3
+ U dan
 -Z 8f9d35d6b39a3409ee54166c5149a9b9
++Z 8a2a73a40bbf3e885ec761eb0e674078

diff --cc manifest.uuid
index 83dbc5ed7f3d5a8134e6d7896852cf95ec67c7fa,2cb0bbfb3c4ce9c33bf3439fe8ea2b8d9729f473..9db48c25327cf198a8a66d2044d9dab977103250
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 0a514e62ad1ebe5c12da8daed429ae2f9d9910471d3c5cef3b6870bdadfefca1
 -71bf91c218334381b1b4bdba6a093e623b62e17f3e8550e154a11f0cb0b404f3
++0fcfc36ceb820fc70136b799a0405fe92e50646e697be2872bbe9a53a05ed5a9